If this started happening out of the blue, something must have changed, and it’s not restic. The goal would be to isolate, identify and verify what has changed.
Thoughts:
-
What changed? OS upgrade/update? Network? ISP? Backblaze? Version of restic?
-
Contact Backblaze and ask them what they changed (assuming nothing else like your computer, network, ISP changed)?
-
Try rclone to see if the same problem persists (ideally coordinating this with the other chap who had the same/similar problem, if that hasn’t been done yet)?