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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.
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.
Hi genamarialena
I forgot to say my Time Machine is on an external disk, not NAS. Still needed full Disk Access, but presumably not needed firewall disabled.
The update 15.1 (24B83) fixed the issue for me with my WDMycloud.
Sequoia Time Machine Synology NAS keeps disconnecting
