Similar issue has re-occurred for us. Just noticed I have dozens of local backups (1.6GB each), while the setting is restricted to value 3. This has worked for years, but I do recall one incident a long time ago when a similar issue happened.
- Backups complete successfully
- Uploads to S3 are successful
- Running the stable branch. Just upgraded to 2.3.7 and rebooted.
Need to dig in deeper at a better time.
The issue has started on 11th of September. That date does not match to our service breaks or anything we would have done for the site.
This is not an isolated case, as my other small sandbox instance has the same issue, it seems. This is in completely different infrastructure, hosted at Digital Ocean. Here the backups have not been deleted since September 16th. Uploads are successful here as well.