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You would usually have multiple disks in a fault-tolerant RAID array, and then on top of that have some sort of backup plan that runs every day or every week (depending on how active you are with this data).
It sounds like you are trying to update or maintain the backup data itself, which is not what you want to be doing. You would do any updates or maintenance on the data that is actually on the drive array, and then let that get backed up automatically during the next backup. Once you have a backup of the data, you don't try and go back and change that, you just leave it on a shelf or in a safe and hope you never have to use it.
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