Issue with Time Machine on a shared Synology drive

I have a Synology NAS that is configured into two storage pools. Pool 2 is dedicated to Time machine for three computers and I have three volumes configured to ensure that the storage space is not shared across Time Machine folders. Each volume then has it's own shared folder for each computer named like:

  • TM_MBP13 (for our MacBook Pro 13)
  • TM_MBA (for our MacBook Air)
  • TM_MBP16 (for our MacBook Pro 16)


Each of the three Time Machine shares has its own user name and password so each TM location is dedicated to one computer as well - no accidental using of other shares. In the past this has worked okay, but I currently have a problem with macOS Monterey 12.1


I have a lot of other NAS shares that connect to my Family server using my personal account. These work great. However, when I connected my time machine share in time machine preference using the dedicated time machine account, it then disconnects my other shares. If I leave it in the state my time machine will back up.


However, if I then try to reconnect my regular share then the time machine share will disconnect and fail the back up.


It appears that with Monterey, it cannot handle the fact that I have different user names and passwords for different file shares on my Family NAS. It will try to use one only at a time.


It never used to be like this and I could have different accounts for different shares on the same server; but now it looks like I cannot. This is very annoying.


I'm trying to determine if this is a Synology issue or a macOS Monterey issue. I'm thinking the later. Anyone else having issues like this and any solutions?

Posted on Jan 18, 2022 9:47 AM

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Issue with Time Machine on a shared Synology drive

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