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Chapter 3: Backup and RecoveryTape Management If a full database backup is taken each day, we recommend that you keep at least twoweeks of backups and all the logs for these weeks. If a full database backup is taken weekly, you should go back at least three generations.The traditional three generations of backup are: Grandfather Father Son Store selected backup sets (month-end, quarter-end, year-end, etc.) for extended periods,as defined by your legal department and auditors.Tape Retention PeriodEven if one tape (backup/archive) is damaged or lost, the tape retention period assures theability to recover the database.System NameRegularBackupMonth-EndBackupQuarter-EndBackupYear-EndBackupArchivesDEV 14 days 31 daysQAS 14 days 31 daysPRD 31 days 24 months 2 years 4 years 31 daysSystem administrators cannot determine tape retention periods on their own.To determine the retention period, administrators must consult the departments that areimpacted, such as accounting and legal. There is room for some negotiation, but theadministrator must comply with the final decision. As a policy, this decision must bewritten down.The offsite storage site is a separate facility (building or campus) from the R/3 data center.An offsite storage safeguards the backups if your facility is destroyed.The magnitude of the disaster will determine what is considered adequate protection: Sending tapes to a separate location in the building or another building in the campuswill be sufficient.If the disaster is confined to the building where the data center is located.3–18Release 4.6A/B