> what stops you from purchasing a 3TB (compressed) tape[1] for $54 and do backups on your own
The tape device costs over $1000 - you would need more than 33TB of (uncompressed) storage space before that becomes worth it compared to buying hard disks and hot plugging them when needed.
The tape device costs over $1000 - you would need more than 33TB of (uncompressed) storage space before that becomes worth it compared to buying hard disks and hot plugging them when needed.