Oh, that explains it.
The problem happened because those settings are not supposed to be the same value – search the setup topic for the line “Do I really need to use separate buckets for uploads and backups?”
A maintenance job ran on the contents of the backup bucket and affected the uploads because their values overlapped.
@sam we should probably enforce that in code, not just documentation
To fix up your site, there’s two steps:
First, you’ll need to change the backups prefix – adding /backups to the end as described in the setup topic, is sufficient.
After, move everything in the S3 bucket back into the correct place. Everything in the top “default” folder should get put back at the top level.
E.g. there’s probably “default/originals” folder there which should be moved up.
You’ll have to use the AWS web console or some other tool to browse the bucket.