Chapter 16 Backup Planner
NAS Series User’s Guide
289
16.4.4 How to Synchronize Files
Synchronization makes the contents on the target device identical to the ones on the source device.
You can synchronize files from a USB device to the NAS or from the NAS to a USB device. In addition, you
may also synchronize files in both directions simultaneously.
Press and hold the COPY/SYNC button until you hear a beep to synchronize files. See Section 16.4 on
page 286 for details about configuring the synchronization settings.
USB -> NAS or USB <- NAS
When you synchronize files in one direction, contents on the source device replace the files on the
target device.
The following figure illustrates how synchronization works when you synchronize files from a USB device to
the NAS. The same concept applies when you synchronize files from the NAS to a USB device.
Figure 238 Synchronizing Files Example 1
Both storage devices contain A.
• A copy of files A and B from the USB device is transferred to the NAS.
• File A from the USB device replaces file A on the NAS.
• File C on the NAS is deleted.
USB <-> NAS
When you synchronize files in both directions simultaneously, both storage devices transfer unique files to
one another. Files with the same file name are synchronized according to their modification date/time.
The difference in modification time between the two files has to be greater than five minutes. More
recently modified files overwrite the older ones during synchronization.
A
C
Before Sync
After Sync
USB
AB
USB
AB
AB
NAS
NAS
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