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My Time Machine backups were working fine until I updated to 15.0.1. Now I constantly get:
The NAS is working fine. I have restarted my Mac and restarted the NAS. Just stopped working after upgrade to 15.0.1.
Mac Studio (2023)
So here's more information from my side.
I use TimeMachine as a convenience, not my only backup option. I've been to this rodeo before with Apple and TimeMachine.
My system wasn't failing to connect to the Synology or the backup data. Everything connected fine. The backup access was long enough to copy 6.5 MB then failed.
After forgetting the target disk and reconnecting it, the OS properly recognized that a prior backup existed, then asked if I wanted to delete the backup history, which sounded like it was different than the actual backup itself. I thought it was just going to delete all the indexes to the backup data and that during the backup process those indexes would be recreated. My Bad.
While fiddling with it a bit more I was watching connections to the Synology.
The Backup starts, creating one SMB3 connection to the Synology.
Then about 5 minutes in, while the TimeMachine application in Settings is still doing the "Cylon bar" & Preparing the backup. There's another SMB3 Connection made to the Synology.
About 90 seconds or so after that, the newer connection is closed.
A few minutes after that, TimeMachine reports that the connection to the backup disc was lost and that the backup failed.
I'll let Apple worry about it. I've spent way too much time over the years being an unpaid Software Quality Assurance person for them. I am a career SQA guy so I'm a bit mercenary about it.
I reported it so that other people who might rely on TimeMachine didn't lose their minds, or their data, trying to fix a problem Apple introduced with 15.0.1
Apple broke it, it's their backup system, it's their OS, they can diagnose and fix it.
Just to add I've had this problem too. I've been back and forth with Synology as I'd just (coincidentally) upgraded my NAS at about the same time as the MacOS update, and as there are quite a lot of errors in the Mac logs relating to Time Machine not being able to access the SMB share I believed this was a Synology thing.
However, I have disabled the firewall on my Mac and finally (after about 10 days back and forth) the Mac is backing up to the NAS. Not sure the full implications of the 'shields down' since I have a firewall running on my Ubiquiti gateway.
Here's hoping for an Apple solution soon, in the meantime the disabled firewall workaround is holding up for me.
Time Machine is not really my data backup solution, because as you imply, it's needs too much hand-holding to be reliable. My files etc are backed up elsewhere on the 3-2-1 principle. But TM really does work well to get you up and running again when you change your hard-drive or SSD or do some other destructive upgrade, without having to set everything up again from scratch.
Anyway - we digress :-/
I must have missed failures from 15.0Xx but now I have 15.1 and time machine will not open. Option click does not fix it and turning off firewall does not fix this.
Back up disk mounts but will not show content just circling arrow
What to do?
Unfortunately it does not. It fails at the end indicating that some files were not available! Disappointing QC with Apple.
Since update to MacOS 15.0.1 Time Machine backups do not work
