Failure to back up your data is an act of negligence.
Data back up is the copying of data to external media such as a tape drive, another computer on your network, etc.
After you have backed up your data always test the backup for problems or errors.
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Prepare a written disaster plan and procedure for recovery, adhere to the plan.
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Design your systems to incorporate centralized data backup.
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Rotate your back up data copy off-site.
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Ensure that archive media is handled and stored properly.
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Refresh your tapes at least every 4-5 years.
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Verify your archive data on a regular basis
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Retain (if applicable) archive data for the legal required periods.