Won't Sync to NAS After Update

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Posts: 2
Joined: 21 Jan 2026

N9sg7

FFS updated to 14.6 today, and now it won't sync any files to my NAS. It gives the following error for every file:
"Cannot write permissions of [file name]. ERROR_PRIVILEGE_NOT_HELD: A required privilege is not held by the client. [SetFileSecurity]"
I tried running as administrator, and the error is the same.
Posts: 4933
Joined: 11 Jun 2019

xCSxXenon

What happens if you revert to 14.5 by downloading it from this website?
Posts: 2
Joined: 21 Jan 2026

N9sg7

I tried 13.9, since that was the newest version installer I had downloaded, and it worked fine. I installed 14.5 and got the same errors and failure. I hadn't upgraded in a while. My NASs are QNAP.
Posts: 6
Joined: 10 May 2026

ncsoro

My NAS is QNAP too. Got the same PRIVILEGE ERROR after upgrade from 14.9 to 14.10. After reverting back to 14.9,, everything is OK again.
Posts: 1239
Joined: 8 May 2006

therube

Just a couple of (related ?) links (& not saying they are the issue nor a way to fix things), but something might relate.

https://learn.microsoft.com/en-us/answers/questions/3999195/a-required-privilege-is-not-held-by-the-client

https://www.ninjaone.com/blog/fix-a-required-privilege-is-not-held-by-the-client-error-in-windows-11/

Particularly odd, I'd think, that reverting to an earlier version of FFS "fixes" things (& then too, different users reverted to differing FFS versions)?
Posts: 6
Joined: 10 May 2026

ncsoro

You are right, it doesn't make sense that reverting should fix the problem, especially on several different versions. In my case, reverting seemed to work, but only for one day, then the problem came back. On further digging, I finally solved the issue by unchecking the Copy DACL, SACL, Owner, Group option. It seems that I have read/write access on my NAS drive but not Full Control. But that is OK, I don't need to change file securities on the backups on NAS drive, so backups are working fine now.
Posts: 4933
Joined: 11 Jun 2019

xCSxXenon

You are right, it doesn't make sense that reverting should fix the problem, especially on several different versions. In my case, reverting seemed to work, but only for one day, then the problem came back. On further digging, I finally solved the issue by unchecking the Copy DACL, SACL, Owner, Group option. It seems that I have read/write access on my NAS drive but not Full Control. But that is OK, I don't need to change file securities on the backups on NAS drive, so backups are working fine now. ncsoro, 29 Jul 2026, 20:17
That setting is unchecked by default and requires running as Administrator if it is selected. You seem to have had it selected but probably weren't running as Admin, thus ran into errors
Posts: 6
Joined: 10 May 2026

ncsoro

No, I am always running as Admin, because I have some locked files to back up. But this was a new install and when I checked the box for Locked files, I must have accidentally also checked the box for DACL,SACL. The problem is with the rights on the NAS, but I don't want to start messing with the privileges on the NAS, so I'm OK with backups without DACL, SACL.