There many ways to take and keep backup safe. I would try to highlight few of them.
1 Onsite backup: for this backup is taken in the same datacenter area. it can be on tapes or it can be on de-duplication devices or backup storage. If backup is taken on tapes. Tapes shall be kept in fireproof closets.
2 Offsite backup: storage location is different than datacenter. If tapes are being used, then tapes are shipped to offsite location as per routine plan. in case of de-duplication devices, Offsite backup device, sync with onsite backup device on daily basis or as scheduled.
3 DR location backup: in this backup is done online and replicated on DR location servers. It also depends on applications.
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