QNAP Systems Ts 253 User Guide

							241 
 
3. Enter the IP address, port number, username and password to login to the remote server. The 
default port number is 873. The login username must have read/write access to the remote 
server and a sufficient quota limit on the server. Click Test to verify the connection, and then 
click Apply. 
4. Specify the local folder by clicking the Source folder box. After expanding and locating the folder, 
double click on it to set it as the directory where the data will be replicated from. 
5. Specify the destination folder Destination folder box. Locate the folder in the folder tree and 
double click on it to set it as the directory where the data will be replicated to. And, click Add to 
add this pair of replication folders. 
6. Click Backup frequency to configure the backup frequency. Select to immediately replicate the 
data or to specify a backup schedule.  
7. Click Options and then select one of the following. 
o Enable encryption: Executes encrypted remote replication. Note that you must enable Allow 
SSH connection in Network Services > Telnet/SSH and specify the same port number for 
SSH and encrypted remote replication. 
o Activate file compression: Allows file compression during the data transfer process. This option 
is recommended for low bandwidth environments or remote replication over WAN. 
o Only copy files that differ from files at the destination: Reduces the time required for transfers 
and minimizes the network traffic. 
o Delete extra files on remote destination: Synchronizes the source data with the destination 
data (one-way synchronization.) Extra files on the destination will be deleted. Source data 
remains unchanged. 
o Handle sparse files efficiently: A sparse file is a type of computer file that contains large blocks 
of zero-byte data. Turning on this option may reduce the time required for remote replication. 
o Replicate ACL and extended attributes: Keeps the information in extended attributes. Please 
note that the destination host needs to enable the same ACL functions or join to the same 
domain. 
o Enable maximum transfer rate: Specifies the maximum transfer rate. 
8. Click Apply. If you selected Execute backup immediately, the replication task will start at once. 
Otherwise it will be performed according to your schedule. Note that the job is recursive. Do not 
turn off the local NAS and the remote server when remote replication is running. 
 
Note: For step 5, the order of selecting the source and destination folders can be changed. The 
above is just an example. 
 
Icon Name Description 
 Start Start a replication job immediately.  
						

							242 
 
 Stop Stop a running replication job. 
 View View Rsync logs (replication results). 
 Edit Edit a replication job. 
 Disable Disable replication schedule. 
 Enable Enable replication schedule. 
 
To configure the timeout and retry settings of the replications jobs, click Options. 
Timeout (second): Specify a timeout value for each replication job. This is the maximum number 
of seconds to wait until a replication job is cancelled if no data has been received. 
Number of retries: Specify the number of times the NAS should try to execute a replication job if 
it fails. 
Retry intervals (second): Specify the number of seconds to wait in between each retry. 
  
For example, if you entered 600 seconds for timeout, 3 retries, and 60 seconds for retry intervals, a 
replication job will timeout in 600 seconds if no data is received. The NAS will wait for 60 seconds and 
try to execute the job a second time. If the job timed out again, the NAS wait for another 60 seconds 
and retry for a third and final time. 
 
RTRR  
 
 
  
						

							243 
 
Real-time Remote Replication (RTRR) provides real-time or scheduled data replication and one-way 
and two-way data synchronization between two locations (such as a local NAS and a remote NAS, 
local NAS and an FTP server, or local NAS and an external drive, or replication between two local 
folders.) In real-time mode, the source folder will be monitored and any files that are new, changed, 
and renamed will be immediately replicated to the target folder. In scheduled mode, the source folder 
will be replicated to the target folder according to the pre-defined schedule.  
 
One way synchronization refers to data synchronization from the source to the destination, while 
two-way synchronization means both the source and destination are synchronized after new files are 
copied in either side or files stored on either side are changed or deleted.  
 
If the backup destination is a NAS, the RTRR server (Main Menu > Backup Station > RTRR 
Server) or FTP service must first be enabled (Main Menu > Control Panel > Network Services > 
FTP) on the remote NAS. 
 
For RTRR, the maximum number of jobs is 400. Each job supports up to 16 folder pairs. 
 
Follow these steps to create a replication job. 
1. Click Create a Replication Job. 
2. When the wizard shows up, click Next.  
3. Select the synchronization locations and click Next. Make sure the destination device has been 
formatted and folders have been created. Select the action to take (Backup, Synchronize, or 
Restore), the synchronization locations, and click Next. Make sure the destination device has 
been formatted and folders have been created. For comparison between available actions and 
their folder pairs, refer to the following table: 
Direction 
 
Action 
Local folder to 
remote folder  
Local folder to local 
folder/external 
drive 
Remote folder to 
local folder 
Backup  
Synchronization 
Restoration  
 
 Two synchronization options are available: one-way synchronization and two-way synchronization.  
o For one-way synchronization, you can choose to: 
Synchronize data from a local folder to a remote folder (NAS or FTP server) 
Synchronize data from a remote folder (NAS or FTP server) to a local folder 
Synchronize data from a local folder to another local folder or an external drive 
o For two-way synchronization, you can choose to:   
						

							244 
 
Synchronize data between the source and destination    
4. Enter the IP address or host name. Select the server type (Windows Share (CIFS/SMB), FTP 
server or NAS server with RTRR service enabled; For two-way synchronization, only the NAS 
server is available.) 
o Remote replication to FTP server: Specify the port number and if you want to enable FTP 
with SSL/TLS (Explicit) for encrypted data transfer. If the FTP server is behind a firewall, 
enable passive mode. Enter the username and password with read/write access to the server. 
Click Next. 
o Remote replication to NAS with RTRR service: Enter the IP address of the RTRR 
service-enabled server. Specify the connection port and select whether or not to enable secure 
connection. The default port number for remote replication via RTRR is 8899. Enter the 
password for RTRR connection. Click Next. 
o Remote replication to Windows Share (CIFS/SMB): Enter the IP address of the Windows 
server. Specify the destination folder, username and password and click Next. 
5. Select the folder pair for data synchronization. 
6. Each sync job supports up to 5 folder pairs. Select more folder pairs and click Add. Click Next. 
7. Choose between real-time and scheduled synchronization. Real-time synchronization copies files 
that are new, changed, and renamed from the source folder to the target folder as soon as the 
changes are made after the first-time backup. Scheduled synchronization copies files from the 
source folder to the target folder according to the pre-configured schedule. The options are: 
o Replicate Now: Replicate data immediately. 
o Periodically: Enter the time interval in hours and minutes that the backup should be executed. 
The minimum time interval is 5 minutes. 
o Hourly: Specify the minute when an hourly backup should be executed (for example, enter 
01 to execute backup on the first minute of every hour.) 
o Daily: Specify the time when a daily backup should be executed (for example: 02:02 every 
day.) 
o Weekly: Select a day of the week and the time when a weekly backup should be executed. 
o Monthly: Select a day of the month and the time when a monthly backup should be executed. 
o Occurs once at: Specify the date and time the scheduled replication job will once be executed 
and this replication job will be executed only once.  
 
Note:  
If a folder or its parent folder or child folder has been selected as the source or destination in a 
folder pair of a replication job, you cannot select the folder as the source or destination of 
another folder pair of the same job. 
You can also create a folder as you select the folder pair. To do so, enter the folder name and 
click the folder icon from the drop down list.  
From QTS 4.1, RTRR can also back up the entire FTP site. To do so, select the root (/) from the  
						

							245 
 
folder drop-down list. Please note that this is only the case when the source is a FTP site. 
Two-way synchronization only supports scheduled data replication.  
The expiration time setting is not available for Replicate Now and Occurs once at in Step 7. 
Bandwidth Control in both RTRR and Rsync only works if both NAS servers of a replication job 
(sender and receiver) are QNAP NAS and use firmware version 3.6 or above.  
 
8. To configure synchronization policy, select Configure policy and filter and click Next. Select 
whether or not to enable the following options:  
o Delete extra files: Delete extra files in the target folder. Deletions made on the source folder 
will be repeated on the target folder. This option is not available for real-time synchronization. 
o Detect sparse files: Select this option to ignore files of null data. 
o Check file contents: Specify to examine file contents, date, size, and name to determine if two 
files are identical. This option is not available for real-time synchronization. 
o Compress files during transmissions: Specify whether or not the files should be compressed for 
synchronization operations. Note that more CPU resources will be used. 
o Ignore symbolic links: Select this option to ignore symbolic links in the pair folder. 
o Replicate ACL and extended attributes: Select this option to keep the information in extended 
attributes. Please note that the destination host needs to enable the same ACL functions or join 
to the same domain. 
o Filter system-generated temporary files: Filters temporary files created by system (including 
thumbnails and @recycle) will be filtered. 
o Timeout and retry settings: Specify the timeout period and retry settings if a synchronization 
operation fails. 
9. Specify the file size, file types to include/exclude, and file date/time to filter data synchronization. 
Enter a job name.  
o File size: Specify the minimum and maximum size of the files to be replicated. 
o Last modified: Specify the number of days files are last modified for replication.  
o Include file types: Specify the file types to be replicated. 
o Exclude file types: Specify the file types to be excluded for replication. 
o File date/time: Specify the date and time of the files to be replicated. 
10. Click Next. 
11. Confirm the settings and click Next. 
12. Click Finish to exit the wizard. 
Icon Name Description 
 Enable and Start Enable connection to a remote server. 
Start a replication job. 
 Stop Stop connection to a remote server or external drive.  
						

							246 
 
 Stop Stop a replication job. 
 View View job status and logs; download logs. 
 Edit Edit the connection settings of a remote server. 
Edit the settings of a replication job. 
 Delete Delete connection settings to a remote server. 
Delete a replication job. 
This button is available only after a replication job is stopped or the 
connection to the remote server is stopped. 
 
To edit the replication job properties, click Options. 
 
Under Event Logs you can enable Download Detailed Logs and specify the maximum file size of 
log files. You can also set up sending email alerts when synchronization fails or completes. SMTP 
server settings must be set up on the NAS before using email alerts (System Settings > 
Notification.) 
 
Specify the replication policy in Policy and filter settings in Filter. These will become the default 
settings for all RTRR replication jobs. 
 
Downloading Replication Job Logs 
 
To view the status and logs of a replication job, click the View button under Action. You can view 
job logs or download them by clicking Download Logs. Log files can be opened by Microsoft Excel or 
text editors. This button is only available after you have enabled Download Detailed Logs in 
Options > Event Logs and executed at least one replication job.  
						

							247 
 
 
 
 
Snapshot Replica 
 
The Snapshot Replica allows you to replicate the volume/LUNs between different remote servers using 
snapshot technology, which provides a flexible and efficient backup service for IT professionals.  
To use this function, please enable the SSH server (Control Panel > Network Services > 
Telnet/SSH) on the remote NAS first. Note that you may also access this function via Storage 
Manager (Storage Manager > Storage Space> Snapshot > Snapshot Replica for volumes or 
Storage Manager > iSCSI Storage> Snapshot > Snapshot Replica for LUNs.) 
 
Note: Snapshots and related features are currently only available for the following NAS series: 
x51*, x53, x63, x70, x71, x79, x80. 
* A minimum of 4 GB RAM is required to use snapshots. 
* x51 series models only support up to 256 snapshots instead of 1024. The HS-251 does not 
support snapshots. 
 
Creating Replication Jobs 
 
Follow these steps to create a snapshot replication job. 
1. Click Create a Replication Job. 
2. Enter a name for this job. 
3. Click Settings to specify the settings for the remote server. Enter the IP address, username and 
password for the remote server. Check Local site if the replication job is for your local NAS. Note 
that the login account must have read/write access to the remote server and sufficient quota limit 
on the server. Click Test to verify the connection. Then click OK. 
4. Select the local volume to take snapshot of by clicking the Source Volume/LUN drop-down list.  
5. Select the destination pool to store the snapshots in the Destination Pools box.  
6. Keep Snapshots: The maximum number is 1024. The system keeps this fixed number of versions 
and automatically rotates stored versions. 
7. Click Backup frequency to configure the backup frequency. Select to replicate the data 
immediately or specify the backup schedule.  
8. Specify other options as follows for the remote replication job by clicking the Options button and 
click OK after setup. 
o Enable encryption: Select this option to execute encrypted remote replication. Note that you 
must enable Allow SSH connection in Network Services > Telnet/SSH and specify the same 
port number for SSH and encrypted remote replication. 
o Enable maximum transfer rate: Enter the value to restrict maximum available bandwidth in 
KB/s. If it is not specified, the bandwidth for this job is not limited.  
						

							248 
 
o Compress files during transmission: Enable this option to allow file compression during the data 
transfer process. This option is recommended for a low bandwidth environments or remote 
replication over WAN. 
o Replicate all snapshots: Select this option to replicate all snapshots. If this option is not 
selected, the system will only replicate the snapshot taken by the job. 
9. Click OK. If you select the Execute backup immediately option, the replication task will start at 
once. Otherwise, it will be performed according to your schedule. Note that the job is recursive. 
Do not turn off the local NAS and the remote server when remote replication is running. 
Icon Name Description 
 Enable and Start Enable connection to a remote server. 
Start a replication job. 
 Stop Stop a replication job. 
 View View job status and logs; clear logs. 
 Edit Edit the settings of a replication job. 
 Enable/Disable 
Schedule 
Enable or disable a scheduled replication job. 
 
The system displays logs of all replications jobs at the bottom of the screen. Click Clear all logs to 
clear job logs. 
  
Deleting Replication Jobs 
 
1. Select a replication job from the list. 
2. Click Delete. 
3. Click OK. 
 
Options  
 
To change connection options, click Options and specify the timeout period of the number of 
connection retries.  
 
In case the password used for access to the remote server is changed, you can click Change 
Password and click the edit button under Action to change the password used for that server.  
 
To delete previous Snapshot Replica logs, click Clear all logs.  
						

							249 
 
 
 
 
Cloud Backup 
 
Amazon S3 
 
Amazon S3 (Simple Storage Service) is an online storage web service offered by AWS 
(Amazon Web Services.) It provides a simple web service interface that can be used to store 
and retrieve data from anywhere on the web. With Amazon S3, you can upload data from 
your NAS to Amazon S3 or download the data from Amazon S3 to your NAS. You need to 
register an AWS account from http://aws.amazon.com and pay for the service. After signing 
up, you need to create at least one bucket (root folder) on Amazon S3 using an Amazon S3 
application. We recommend the Mozilla Firefox add-on S3Fox for beginners. 
 
 
After setting up the Amazon S3 account, follow these steps to back up or retrieve data from 
Amazon S3 using the NAS. 
1. Click Create a Replication Job. 
2. Enter the remote replication job name. 
3. Select the usage type: Upload or Download and enter other settings. A bucket is the 
root directory on Amazon S3. You can test the connection to the remote host testing by 
clicking Test. Other settings are optional. 
4. Specify the local directory on the NAS for replication. 
5. Enter the replication schedule. 
6. Click Finish. The replication job will be executed according to your schedule.  
						

							250 
 
 
 
 
External Backup 
 
The following topics are covered in this chapter: 
External Drive 
USB One Touch Copy 
 
External Drive 
 
The NAS supports real-time and scheduled data backup between internal disks volumes on 
the NAS and external USB/eSATA storage devices.  
 
 
To use this feature, follow these steps. 
 
Note: If an external storage device is encrypted by the NAS, make sure it is unlocked in 
External Device > External Storage before creating any backup jobs. 
 
1. Connect one or more storage devices to the USB or eSATA (if available) interfaces of the 
NAS. 
2. Click Create a new job.  
3. When the wizard is shown, read the instructions carefully and click Next. 
4. Select the backup locations. 
a. Select an external disk volume from the drop-down menu. The NAS supports EXT3, 
EXT4, FAT, NTFS, and HFS+. The storage devices general information will be shown. 
b. Select Map this backup job to the volume ID only to map the backup job to this 
particular external storage device. The NAS will recognize the device and automatically