I was watching this because I have a bunch of sites backing up to S3. But I just noticed that I’m seeing this behavior on a site running 2.7.0.beta9. And I don’t have any explanation for that.
I don’t suppose you’re using Digital Ocean Spaces, are you?
And a manual backup to AMS3 just failed with
[2021-07-28 21:03:03] EXCEPTION: This multipart completion is already in progress
but there’s already a backup there.
I am soon going to re-double my efforts to get everytrhing everything off of Spaces.