nothing (also) beats an external hard drive with RAID mirroring that you unplug after a backup.
Actually, there is a lot that beats both an external RAID and a Tape library...
Avsim, big as it was, really needed a proper DR schema in addition to a proper replication and backup (and failover) schema.
The schema that they presented was flawed to be polite, and absolutely crazy if you want to leave politeness at the door.
At their level, they needed to be setup professionally.
I sure hope SimHQ has it's sh*t in one sock.