This has started happening since upgrading from OS 15 to 15.1. I get a message that the backup could not be completed, as below. No idea what "files unavailable means" or why it stops when the Mac is not awake. Once awake, I resume and it backs up as normal, so what's going on?
Mac Studio (2023)
I resolved the issue after working with an Apple support person. I have an MBP M1 Pro with MacOS 15.1.1. and I had failures with TM both on NAS and hard wired backups. My workaround, as per the boards, was to to turn off the MacOS Firewall to let the backups work to completion.
However, I also have a cyber security software which includes a firewall of its own. There is a conflict between its firewall and the MacOS one starting with Sequoia 15.x. After I turned off the security software firewall and left the Mac OS one active, all TM backups work without error. The 3rd party cyber security software firewalls need to be updated for Sequoia.
I resolved the issue after working with an Apple support person. I have an MBP M1 Pro with MacOS 15.1.1. and I had failures with TM both on NAS and hard wired backups. My workaround, as per the boards, was to to turn off the MacOS Firewall to let the backups work to completion.
However, I also have a cyber security software which includes a firewall of its own. There is a conflict between its firewall and the MacOS one starting with Sequoia 15.x. After I turned off the security software firewall and left the Mac OS one active, all TM backups work without error. The 3rd party cyber security software firewalls need to be updated for Sequoia.
Cartoonguy wrote:
This has started happening since upgrading from OS 15 to 15.1. I get a message that the backup could not be completed, as below. No idea what "files unavailable means" or
why it stops when the Mac is not awake. Once awake, I resume and it backs up as normal, so what's going on?
https://discussions.apple.com/content/attachment/9631005f-4f2c-4acb-9218-c0fb4effd603
Seems normal
Back up your Mac with Time Machine - Apple Support
> System Settings > Battery>Options and check Power Nap
this will allow your Mac to back up to Time Machine while sleeping
if you have an issue—
Time Machine troubleshooting on Mac - Apple Support
This is an Apple defect that has several variations and workarounds found by the boards. Apple has not offered yet any credible solution or explanation. Apple support and engineering know this from mid-October but nothing has been offered as a solution. The support team at Apple will insist that you upgrade and call them back if it does not work. It won’t.
I tried your solution and it did not work for me. The workaround that works for me is turning off the Apple Firewall. [MacBook 2021 M1 Pro, Sequoia 15.0.1]
Check the threads:
log out and log in that solved it immediately for me. updated today to 15.1.1 and the problem was back. loged out and in and now time machine is working again. Don't just turn the computer off. Log out while open and log in again.
Since Sequoia 15.1, Time Machine does not back up
