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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.
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
