A full backup captures all data on the machines. The backups are set to verify the data on tape against the data on disk automatical ly. A random selection of files is selected for restore from each backup to further ensure media and data integrity. These monthly backups are stored off-site in a secure room at the College of Veterinary Medicine. CAIC performs daily differential backups on production machines on Monday-Friday.
Differential backups capture all data that has changed since the last full backup.
This system requires more tape storage capacity but allows a full restore from only t wo tapes. Backups are set to verify data automatically and files are randomly selected for restore. These tapes are rotated between the DH Hill library during the week to minimize potential data loss from theft or a building-centered disaster. The enti re five-tape set is rotated to the College of Veterinary Medicine quarterly to prevent overuse of the tapes.