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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.
Subsequent to my previous posting on this thread and elsewhere, I can confirm that my TM backups to my Synology NAS now happen consistently nightly as expected, under Sequoia 15.2.
To get to that point I did have to deleted my previous (pre-Sequoia) TM backups and start afresh, and under 15.1.1 I did use AutoMounter app to maintain the "link" so that the network connection did not drop. I now no longer need to use that.
Hi,
since I was seeing the same issue with macOS 15.0.1, I am not seeing it anymore. If I remember correctly, under version 15.0.1 disabling the firewall was helping as a workaround, and starting with version 15.1 TM backups and other remote services did work even with the firewall enabled.
It is maybe a long catch, but have you disabled AFP on your NAS? I have my Synology (620slim) configured to use SMB only, and I did not encounter any issues anymore using TM or any other services on the NAS.
BTW.: Im using a MacBook Pro 16 with Apple Silicon.
I received a note from tschloesser with the suggestion to turn off AFP. Now, before I did that I had updated DSM to 7.2.2 as well. I think turning off AFP did the trick but I need to go back and check this to be sure. I'm just using SMB and, right now, everything is working like it did before.
Thanks to tschloesser for the suggestion.
Unfortunately it does not. It fails at the end indicating that some files were not available! Disappointing QC with Apple.
Finally! Sequoia 15.2 appears to have fixed the TM vs Firewall problem for me. My TM backups to drives attached to my networked Mini now work with the source MacBook's firewall enabled.
Good news : upgrading to macOS 15.2 fixed the issue for me.
I could re-enable the firewall and the Time Machine backup did not fail as it did before.
No. 15.2 did not fix it. And I do not force sleep or use a firewall on this machine.
Apple knows about it and better fix it as TM is mission critical.
After a few days it appears on my M4 that TM is somewhat sporadic. When it fails it is usually around 75% complete when it reports it cannot find disk.
Since update to MacOS 15.0.1 Time Machine backups do not work
