In computing, off-site data protection, or vaulting, is the strategy of sending critical data out of the main location ("off" the main "site") as part of a disaster recovery plan. Data is usually transported off-site using removable storage media such as magnetic tape or optical storage. Data can also be sent electronically via a remote backup service, which is known as "electronic vaulting" or "e-vaulting". Sending backups off-site ensures systems and servers can be reloaded with the latest data in the event of a disaster, accidental error, or system crash. Sending backups off-site also ensures that there is a copy of pertinent data that isn’t stored on-site.