Same Problem here, for 2 days now.
The repair message also states:
Further information can be found in the logs.
The only question is where?
There is nothing to be found in the logs from the Home Assistant Core, Supervisor and Host, and I cannot find an extra backup log.
I assume that the servers are overloaded, since it worked yesterday when the automatic backup was triggered manually and today:
Possibly too many people in one time zone in Europe for the servers?
Greetings from Germany