We use Backup Exec, the infrostructure kit backs up to virtual tape on two separate servers, one for mon and wed, the other for tues and fri, these are incremental, then on the weekend we do a Full backup, these all then gets streamed to tape each day, the Telephony kit is backed up straight to tape, then each day, a company called Iron Mountain arrive on site and collect the tapes and drop of the next days tapes.