You define an archiving strategy for a mailbox policy on the tab. You can base the archiving strategy for an Exchange Mailbox Policy on one of the following:
Age: items are archived when they have not been modified for the time that you specify.
The age of a mail message is taken from the date when it was received or sent. The age of a document is taken from the date when it was last modified.
Quota: archiving keeps a percentage of each user's Exchange mailbox storage limit free.
Age and quota: Enterprise Vault performs age-based archiving first. If age-based archiving does not make the required percentage of mailbox storage limit free, quota-based archiving continues until the required percentage is reached.
Archiving based on age and archiving based on quota or age and quota are the main strategies for selection of items to archive. You can also configure the policy so that Enterprise Vault archives large items first. Archiving large items first operates in addition to the main archiving strategy. Archiving large items first has the following advantages: