ZyXEL NAS540 User Guide - Page 229
USB <-> NAS
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Chapter 10 Applications 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 120 Synchronizing Files Example 1 Before Sync USB NAS AB After Sync USB AC NAS AB AB 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. NAS540 User's Guide 229