January 12, 2015 at 2:54 pm
There are a lot of what if's here like SLA's and RPO/RTO. The simple answer is no, you don't need to store it twice on the SAN. I would say you need a backup solution separate from the SAN. Something that stores your backups on faster media for a period until it can be saved off to tape and to provide faster recovery. We use Netbackup although I am sure there are a multitude of better products out there.
January 12, 2015 at 4:08 pm
If the SAN goes, and they do, you lose all your backups. Yes, I would absolutely have a second location. Tape at least.
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