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I have just upgraded my 2018 Mac Mini to MacOS 15 Sequoia.
Since 2019 it has always backed up to a folder called TMFolder on a Synology DS413j.
( My partner's Mini also backs up to the same NAS, but hers is still on Sonoma. Her backups still run successfully. )
Every time Time Machine on my Mini tries to backup to the NAS now, it reports:
The backup will fail anywhere between one and five minutes after starting.
Mac mini, macOS 15.0
In my case I had updated to 15.0.1 and then experienced the problem. Turning the macOS firewall OFF was the only way I've found to complete a backup to my Synology NAS. Previously I was able to back up with the firewall on while on Sequoia 15.0.
Is anybody still seeing the issue? Ever since upgrading to Sequoia, my SMB share on my Synology keeps on disconnecting after sleeping. I'm not using Time Machine unlike most people here, but I have the same symptoms.
My Synology is pretty old and is on DSM 6.2 and I figured it might just be that, but I tried creating an SMB share on a Freebsd and got the same behavior.
Thanks for confirming that you are seeing similar issues with a newer version of DSM. I don't seem to have it as bad as you. When I'm working on the machine, the share seems to stay, but it's really when going to sleep. I can always reconnect, albeit slowly, which I assume is due to the Synology waking up. Worst is, I'm not seeing any trace in the console of anything.
For me it was simply because I had changed password on the NAS. I suspected Sequoia since I upgraded at the same time.
Time Machine will not prompt that the authentication failed, it only shows if you view the logs...
Removing and re-adding the share in Time Machine settings did the trick
I did one more thing that seems to have helped. I deleted some redundant/erroneous/duplicate credentials for the NAS that were in Keychain Access.
Did that. As you said, it took hours to create the sparsebundle, but no interruption. This morning, I found that the incremental backups failed "because some files were not available"...
Indeed, 15.0.1 seems to contain the fix. Since updating to 15.0.1, I have been able to turn the MacOS firewall back on, and Time Machine is still behaving itself.
I tried a subsequent backup with the firewall still on, after the successful backup with the firewall off, and it worked fine. Maybe turning the firewall off is a one time thing? We'll see.
Thank you. It would have taken me ages to find that on my own!
There is a Help Forum for Synology that might interest you.
There are other pages on the site. I just picked that one as a example.
This worked. Thanks.
I found the same error in the logs. I've disabled the widget and the error hasn't reappeared, but I need to observe it for a while longer.
Which widget are you talking about?
Same issue.
MacBook Pro m3 Pro, macOS Sequoia 15.0.1 + ASUSTOR ADM 4.3.2.R9Q2.
WTF network connection should work with all kinds of versions of smb. Even the share on my macmini (sequoia) is unstable/not working with my MBPM1.
Sequoia Time Machine Synology NAS keeps disconnecting
