Creating a backup up is one thing, but being able to perform a good and reliable recovery is different story. There is only one way to be sure you can and that is.. test .. test .. test.
Most (backup) administrators perform a test restore on a regular basis, but what if your full environment is destroyed.
A disaster situation like this is much more complicated, there are always dependencies you did not though of before.
My CFIT Colleague Marcel van der Berg performed a disaster recovery test. In his test case only the tapes were left to work with. In his blog-post things-to-consider-when-using-microsoft-dpm-and-veeam-backup-replication, he describes the dependencies he found during the DR test.