We're using the Gitlab CE for our internal use, but one of our customer's is on Gitlab.com. We're likely still going to recommend Gitlab.com after this, but also enable mirroring to our internal instance.

As a side note, I just checked our S3 Gitlab backup bucket and it does have backups for every day for the last year (1.8 GB each yikes) so instead of failing to create the backups, its actually failing to delete the older ones! :)