Backup version retention

When you configure the product with the Configuration Wizard, specify how many backup versions to be retained for each device class that is defined. Each device class can have a specific retention rate rather than one defined for all device classes. During configuration, specify the MAX_VERSIONS for each DEVICE_CLASS.

For example, if two device classes are configured and the first has a MAX_VERSIONS set to 2 there are always two versions that are kept for that device class. The oldest version is deleted once a new backup is made. If you configure another device class with MAX_VERSIONS set to 3, it always retains three backup versions for that device class. If you do not specify a USE_FOR device class option, and you have two device classes in use with a MAX_VERSIONS set to 2, there are four versions that are kept in total.

Example of MAX_VERSIONS for different device classes profile

In the following example, there are four backup versions to be kept when backups are taken with DC_XIV1 and four backup versions to be kept when backups are taken with DC_XIV2. Three backup versions are kept for backups that are taken with device class STANDARD. All other device classes have a MAX_VERSIONS value of two, in this case SOME_OTHER_DC. That means that 13 backup versions are kept with this profile: two for SOME_OTHER_DC, three for STANDARD, and four each for DC_XIV1 and DC_XIV2. Thirteen backups are retained for this sample profile.

>>> CLIENT
MAX_VERSIONS 2
MAX_VERSIONS 3 USE_FOR STANDARD
MAX_VERSIONS 4 USE_FOR DC_XIV1 
MAX_VERSIONS 4 USE_FOR DC_XIV2
DEVICE_CLASS STANDARD DC_XIV1 DC_XIV2 SOME_OTHER_DC
APPLICATION_TYPE GENERIC
TSM_BACKUP NO
NEGATIVE_LIST NO_CHECK
<<<

>>> DEVICE_CLASS STANDARD
...
<<<

>>> DEVICE_CLASS SOME_OTHER_DC
...
<<<

>>> DEVICE_CLASS DC_XIV1
...
<<<

>>> DEVICE_CLASS DC_XIV2
...
<<< 

In the following example, MAX_VERSIONS is set to 2. There are four backup versions retained, two for each device class as there is no USE_FOR device class option specified.

MAX_VERSIONS 2

>>> DEVICE_CLASS STANDARD
...
<<<
>>> DEVICE_CLASS SOME_OTHER_DC
...
<<<

is the same like:

MAX_VERSIONS 2 USE_FOR STANDARD
MAX_VERSIONS 2 USE_FOR SOME_OTHER_DC

>>> DEVICE_CLASS STANDARD
...
<<<
>>> DEVICE_CLASS SOME_OTHER_DC
...
<<<