Timemachine Back-up in MacOS 26 (Tahoe) does not work on Synology DS920+ NAS

After I updated to Tahoe, TimeMachine started to backup on the NAS On the existing AFP share, but stopped. After restarting it stopped again.

Then I deleted the existing Back-up and I configured the NAS as required with SMB.

Now I get the login errors.

The other Shared folders are only accessible when I configure AFP again.

As workaround I have my personal data files stored on iCloud-drive.

Besides my Synology DS224+ NAS unit, I also installed one Unifi UNAS2 NAS unit, but experience exactly the same result, it doesn´t work with MacOS 26 computers. Earlier MacOS computers work just fine with the Time Machine.

I tried following the instructions on the DS 120J, which I use just for storing backups, but it still doesn't work. It transfers the profile, starts up, and then immediately stops with an error saying that the disk has been disconnected. Which is nonsense because I can see it in Finder. I have an exception in my firewall and everything is OK. The update just somehow ruined the whole Time Machine.

Time machine stopped backing up to my NAS DS423, the 15/9, the same day i updated to MacOs 26. Before that date backup worked like clock. I´ve been through all loops and hoops I can think of to no avail.

I have other software like Lightroom that flawlessly backup to my NAS and software that uses the NAS for different purposes.

Whatever I do all i get is the message that ”DS423.local is not available”. I can mount the backup folder in TM without problem but after few seconds after the backup have started i get thar error message

It works! I tried it on Synology without encryption for now, Thank you very much

Look in this thread and under my username for the solution – I posted an exact guide for your problem.

Thanks for your answer. I did reboot the DS920+ and it did not work.

Next try was to kill AFP and tested it again. Now the DS902Plus share is shown in Network and Finder, but an error was shown. IP-adres not available or something.

On my iPhone and iPad I can login at the NAS and I can access shares and files, but on MacOS Tahoe I still get no permission.

The Synology-assistent.app shows the Root Share DS920Plus and redirects via Safari to the Webportal, on which I can login.

Can you post the link to this kansen article, because I’m not sure I have configured the setting right.

Now I have SMB only and AFP disabled and the Share is shown up.

Finder and TimeMachine does not find the IP-Adress for DS920Plus.

willem-blues wrote:

Can you post the link to this kansen article, because I’m not sure I have configured the setting right.

Now I have SMB only and AFP disabled and the Share is shown up.

Finder and TimeMachine does not find the IP-Adress for DS920Plus.

I used the same article as the link in your original post. If it helps, here are my settings for the NAS.

[Edited by Moderator]

Aha, unfortunately I have consulted this issue with Apple and Synology. The procedure regarding WD is unknown to me. But try the option with the terminal using the SMB protocol (SMB ….. yes). By default, this command in macOS is empty – at least it was empty for me…

Might be worth checking out. Out of old habit I never name anything with other than English characters but I guess I might have missed that.

If you could tell me where you found the sparse bundle in Disk utility that would be awesome. I´ve never ever really tinkered with macOS file system

The file mentioned which needs a change does not even exist on my machine. I also do not have wierd characters in my backup volume name. And why is this a problem all of a sudden in Tahoe. Why is apple breaking so much stuff with this release uch...

Did it help to activate AFP? Apple don't recommend AFP on newer Mac.

Thanks.

I have the same settings.

It doesn't work though.

I got the same result. All boxes checked as suggested, but TM plainly just does not work... An older MacBook with older version of MacOS just works fine though...