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42 Adding TL895 Libraries to the Compaq Enterprise Backup Storage System
Keeping Partial Backups
This allows you to define the way tape sets are managed between the full and partial backups.
There are three options:
1. On the same tape set as the full backup--Full and partial backups for one cycle (usually
one week) are all part of a single tape set. The retention schedules for these cartridges
must be equal. With this option, all partial backups are retained as long as the preceding
full backup is retained.
2. Together on a different tape set from the full backup--Partial backup data is written to
a dedicated tape set that is separate from the full backup tape set. Each day's partial
backup is "appended" to the end of the last partial backup. One retention period is defined
for the entire partial backup tape set. This is the most common option since most users
choose to define a longer retention period for full backup tape sets than the partial backup
tape sets.
3. On individual tape sets--Each day's partial backup is written on a separate tape set. Any
excess capacity remaining on the last tape of the day's partial backup is wasted since the
next day's backup is written to a new tape set.
Erase Partial Backups
This allows you to define the retention procedure and erase schedule for your partial backups.
This option does not appear if you selected " On the same tape set as the full backup" on the
previous question.
Between Full Backups
This only appears if you choose to perform differential backups and also choose to keep each
partial backup on a separate tape set. There are two options:
1. Keep all differential backups--Each differential backup within a cycle is retained until
the time stated within the " Erase partial backups."
2. Keep no more than this many differential backups--Differential backup tape sets will
be recycled after there are the specified number of differential backups or when the time
stated within the "erase partial backups" is reached. For example, if you are performing
differential backups on M-F and specify "2" for this question, you will perform
differential backups on Monday and Tuesday. On Wednesday, Monday's tape set will be
deleted. On Thursday, Tuesday's tape set will be deleted.
Tape Sets
This shows the number of tapes required for this server.
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