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2.3.2 Number of backup versions
Determine the number of changed copies that you want to keep of a file that
exists on the client when the backup task runs. How many different versions of
that file do you want to be able to restore? For example, if backup runs every
night and a file changes every day, and you want to be able to restore any version
up to one week ago, then you would choose 7 as the number of backups to keep.
You will use the Number of Backup Versions field as a basis to group your data
storage requirements into management classes.
2.3.3 Backup file retention period
Determine the number of days you want to keep a backup version of a file (other
than the current version). There are two options: keep the backup version for a
set number of days; or specify NOLIMIT, which implies that you want Tivoli
Storage Manager to retain all backup versions, other than the most recent
version, indefinitely (the most recent active version is already stored indefinitely
by default).
2.3.4 Number of deleted versions
Determine how many versions of a file to keep after the file has been deleted
from the original file system. This parameter comes into force during the first
backup cycle after the file has been deleted. For example, assume you are
keeping seven versions of a file as specified above, and you have set this
parameter to one. When the next backup cycle runs after the file has been
deleted off the client, Tivoli Storage Manager will flag the six oldest backup
versions of the file for deletion and just keep the most current backup version.
2.3.5 Last deleted file version retention period
Determine the number of days you want to keep the last backup version of a file
after it has been deleted from the client. There are two options: keep the last
backup version for a set number of days; or NOLIMIT, which implies that you
want to keep the backup version indefinitely.
For example, if you are keeping one version of a deleted file, and you set this
parameter to 60, then 60 days after this file is noticed by Tivoli Storage Manager
as being deleted from the client file system, the one remaining backup version
will be deleted from Tivoli Storage Manager.
Chapter 2. Implementation planning
27
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