WebMail users may request the restoration of their mailbox from a 'snapshot' (point-in-time image). Snapshots of mailboxes are taken every 4 hours, and are retained for 7 days.
UITS Computer Operations supports the service of restoring files. Files are restored from the system backups, which are done on an incremental basis: edited or newly created files are backed up that day; all files are backed up each week, and each quarter (on some systems).
A few of the servers providing backup: