Errors in client log

ERROR: Token id for user not found
ERROR: Token id for group not found
ERROR: Error getting extended attribute “system.posix_acl_access” of file “/sys” errno: 95
ERROR: Error getting extended attribute “system.posix_acl_default” of file “/sys” errno: 95

I’m getting the above 4 errors in my client log every day.
/sys/* is in the exclusion list, so I’m not sure why it is even looking at the path.

The logs in the GUI indicate backup was successful — 0 warnings and 0 errors.

Linux (Debian Stretch) Server is 2.1.20
Linux clients are 2.2.0.0

Anybody know the cause of them, or how to eliminate them?

TIA

Uroni, can you help with this?
I had debugging on, and saw no additional information pertaining to the errors.

In New noob to urbackup .) - #4 by Andreas_Scholdan @uroni has said:

Some permissions cannot be mapped during backup. This isn’t that much of a problem. Worst case you are unable to browse the backups as non-root user from the client