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While this isn't an NBU issue, we have had 2 bad RAID controllers which have marked multiple disks bad at the same time. This took down the RAID set we use for our MSDP. We were hit at both out Primary and DR site within 6 months. This storage system is made by a very reputable vendor so we were surprised to have this issue not once but twice.
We lost 4 weeks of on disk retention. All of my backup jobs are duplicated to tape "just incase". I had the "just incase" happen but I can tell you my management that hated paying for a couple of LTO drives loved that I fought them to spend the extra money. We have 2 very important restores for Audit purposes that I would not have been able to do if I didn't have tape.
As for Data Domain, we moved away from them because of the cost. We got 4x the amount of RAW disk space for half the price of buy a Data Domain box. We then setup Storage Lifecycle polices to duplicate data and this works just like to Data Domain boxes we retired. Data Domain is a good product but to me with SLP and MSDP, Data Domains are over priced now.