User guide
ASUSTOR NAS User Guide
Page 24 of 52
2.5 Backup & Restore
2.5.1. Remote Sync
Remote Sync (Rsync) can allow your NAS to be used as a backup destination or backup
source. When using your NAS as a backup source, you can choose to back up the data
from your NAS onto another remote ASUSTOR NAS or Rsync compatible server. When
your NAS acts as a backup destination, you can back up the data from another remote
ASUSTOR NAS or Rsync compatible server onto your NAS.
Reminder: If you wish to use Remote Sync while using your NAS in conjunction
with another remote ASUSTOR NAS, please remember to enable the Rsync server
feature on the remote NAS (Services -> Rsync Server). For more information
please see Rsync Server 2.2.9.
Use encrypted transmission: If you choose to use encrypted transmission, you will
have to enter the other host’s SSH connection information in addition to your Rsync
account information.
Use 1 on 1 folder synchronization: If you decide to use 1 on 1 folder synchronization,
all the data in the designated destination folder will be synchronized with the data in
your source folder (you may only select one folder). The contents of both folders will
be exactly the same. If you decide not to use this feature, all your chosen source
folders (you may select multiple folders) will be copied one by one to the destination
folder.
Keep extra files at the destination: Once the copying and synchronization of files is
completed, the data at the source and destination should be exactly the same.
However, sometimes there are extra files present at the destination. These files are
only present at the destination but not at the source. By enabling this option, these
extra files will be kept at the destination and will remain untouched.
Archive mode (incremental backup): After enabling this feature, successive backup
jobs (after your first backup job) will only copy the data that has changed since your
last backup job (block level). For example, if you have made some small changes to a
10 MB file, incremental backup will only copy the portions that you have made
changes to. This can significantly reduce bandwidth usage.
Compress data during the transfer: During backup you can compress the data that is
being transferred thereby lowering bandwidth usage.
Keep file metadata: When you enable this option, certain file properties (permissions,
extensions, attributes, owner, groups, etc.) will be sent along with the file to the
destination.
Support sparse files replication: You will only need to enable this option when the
data that you wish to back up contains sparse files. Normally, you will not have to
enable this option.
Mission Mode: Sometimes backup jobs may be stopped because of various
connection problems with a busy server on the other end. ASUSTOR’s Mission Mode
option allows you to configure the number of connection attempts and time interval
for connection attempts, ensuring for the successful completion of your backup job.