Lan-Free Backup

A LAN-free backup is a backup of server data to a shared, central storage device without sending the data over the local area network (LAN). It is usually achieved by using a storage area network (SAN).^[1]

Note that trivial backup to a dedicated, unshared storage device (such as local tape drive) does not meet the definition.^{[citation needed]}

Technical aspects

The goal of LAN-free backup is to reduce the load on LAN and reduce the time it takes to complete the backup.^[1] It offers an alternative way of backup than a simple data copy to network-attached storage (NAS) over LAN.^{[citation needed]}

It comes in different flavours:

with backup server:^[1] in addition to a shared storage device (usually a traditional tape library), there exists a central server arbitrating access to device (for all the other SAN servers). The central server however, does not handle data stream itself.^{[citation needed]}
without backup server:^[1] the storage facility (usually a virtual tape library, or VTL) is smart enough to handle multiple data accesses without intermediate component.^{[citation needed]}