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backup rotation

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(operating system)backup rotation - Any system for re-using backup media, e.g. magnetic tape. One extreme would be to use the same media for every backup (e.g. copy disk A to disk B), the other extreme would be to use new media every time. The trade-off is between the cost of buying and storing media and the ability to restore any version of any file. One example is the Grandfather, Father, Son (GFS) scheme.
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A common off-site backup rotation cycle is a week, and this should be the minimum--losing a week of data would hurt most organizations, but would not be devastating.
Protect computerized data with off-site backups: steps to safeguard ... by Eckert, Bruce / Nursing Homes
Rewritable media is best suited for a typical weekly backup rotation cycle.
The SMB users guide to data protection by Pofcher, Steven / Computer Technology Review
backup rotation schedules and archiving procedures, including any backup programs in use at any relevant time.
Digging for e-data: you won't find `electronic evidence' and ... by Nimsger, Kristin M. / Trial
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