How do I keep two folders on the same NAS synced?

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How do I keep two folders on the same NAS synced?

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DS418play, DS213j, DSM 7.0.1-14401
Sync is not backup. Consider too... what if NAS fails? Why not external USB drive?
 
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DS218J
i thought sync is like a real time back-up.

Sure, but if the NAS fails, the disks themselves should be fine right?
 
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DS220+ : DS1019+ : DS216+II : DS118 : DS120j : APC Back UPS ES 700 — Mac/iOS user
As @Telos said. Backup. Use HB. You’ll have versioning too. Saved me a few times.
 

fredbert

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i thought sync is like a real time back-up.
Sync isn't backup. Backup is for recovering data when the primary/main instance fails or gets deleted. Sync is for availability of dat, e.g. offline.

Drive does sync but also has historical versioning. If you backup the Drive application and data folders using Hyper Backup to another device then you have sync'ed data with recent changes to rollback to plus longer term backup not on the original disk.
 

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