@jmrapin good job! after removing the untracked files, problem wasn't solved, and then i followed your instructions and it worked, thanks a lot!

Having the same issue here with metadata backups, tried Backblaze bucket and Amazon. Also the vm backups to S3 are failing usually with VDI_IO_ERROR(Device I/O errors) or "Error calling AWS.S3.upload: socket hang up" (but working to NAS). Is there somebody who made backups to S3 to work somehow?