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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Full/Incremental Pattern
Full/Incremental Pattern
The most common way of performing backups is to take full backups on a
regular basis, with incremental backups in between. To
avoid the management of too many tapes, the number of incremental
backups should be as few as possible. The average frequency is one full
backup every week, plus five or six incremental backups (one per day) in
between. This is shown graphically in Figure 1.
This way of performing backups implies:
- One tape (or set of tapes) per day
- Very little data on each tape (except the full backup tapes)
- When performing the second
full backup, you ignore all of the previous full backups, erase the
tapes, and send them back to the scratch pool.
The administration of the
tapes, inventory and tracking, tape labeling, and archiving must be done
manually in most cases. In addition, each time you do a full backup (on
Sunday), you send all of the data again.
When doing a full restore, you
will need to start with restoring the full backup, then restore from
every incremental backup.
Figure 1. Tape Usage in Full-Incremental Backup Pattern
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