AWS does regular integrity checks on all media, and repairs any errors it finds. This includes Glacier and Deep Glacier. (It's in the first few bits of the S3 d

AWS does regular integrity checks on all media, and repairs any errors it finds. This includes Glacier and Deep Glacier. (It's in the first few bits of the S3 docs) Backblaze B2 is untrustworthy. I specified a bad encryption key- and it accepted the data, but it wasn't retreiveable. For the extra $1/TB/mo Wasabi is the best For hot backups, IMHO. Also, I theorize that you can avoid the major cost of AWS Glacier deep archive by downloading it through CloudFront- which has 1TB/no free. So: 1. Make your restore request near the end of the month. 2. Glacier restore ~2TB of days (bulk restore, slow.) to S3 hot tier. 3. Download 1TB while on the tail end of the first month, and another 1TB when CloudFront resets. The huge egress costs are minimized this way, as well as minimizing the GB/s charges of regular S3.