that is a very good question.
every data center regularly backs up information in their servers. it may be a daily business or something a little less often. the data center will obviously need a lot of disks or tapes to store backup and since it is not a one time buy, we have to see if we can use any cheap alternatives. disks are more expensive than tapes and if you are using up terabytes of disks everyday, you can clearly see the mounting costs.
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