By using FSA version pruning, you can control the number of versions of files that are stored in Enterprise Vault archives.
Each time a file is recalled and modified, subsequent archiving means that another version of the file is stored in the archive.
Pruning is the process of deleting the earlier versions of archived files, until the required number of versions remains.
To configure pruning
In the Administration Console, expand the Enterprise Vault site until the Enterprise Vault Servers container is visible.
Expand the Enterprise Vault server that runs the task you want to modify.
Right-click the name of the File System Archiving task you want to modify and, on the shortcut menu, click Properties.
Next to Prune to, select the maximum number of versions of each file you want to retain in the archive.
If you also want to prune according to the amount of time that items have been archived, select Enable age-based pruning and specify the maximum age allowed for archived items.
Age-based pruning never deletes the final copy of an archived file, regardless of its age.
Under Scheduled Pruning, define the schedule that you require and then click OK.