Time machine doesn't work with Qnap with the new macOS Tahoe

Users have reported that if the name of your computer or backup has special characters / accent marks then it fails. For example, John’s Backup works but Jöhn’s Backup does not. If that’s the case, rename it.

You could try removing the NAS share as a TM backup destination, then adding it back (you should be able to claim the existing backups when you re-add it).

FilipOn wrote:

Hello,

My MacBook is backed up via lan to Qnap TS-435XeU. Since the new macOS, Time Machine doesn't work. I have tried almost everything to fix it, including delete all back up files on NAS . The NAS is connected, I am able to open any file there. But Time Machine always fails with a message Try backing up again when "Time Machine" is available. Strange thing is that Time Machine creates folders and files, but after while it fails.

I have change any settings since Tahoe installation.

Could you help me? Thank you

Simplify the name is advised. Report back your success or failure.

further—Trouble Shooting Time Machine

Time Machine troubleshooting on Mac - Apple Support

Anyone could help me please? Thank you very much.

Possibly the people at Qnap Support.

I have exactly the same problem on QNAP TS646 since MacOS version 26. The name of the MACBOOK is ChvMCBook and the timemachine folder on the NAS is: Tbackup. It reports exactly the same thing... Please advise what to do, as everything was working fine before...