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The Backupserveris the machine on your network that runs the Backup server
software, stores the client indexes and media database, and provides backup and
recover services to the clients on the network. You can connect storage devices to the
Backup server or attach them to storage node machines. The Backupclientsmust
have the client software installed and must be included in the server's list of clients.
All server and storage node machines that you want a client to back up to must be
listed in the nsrhostfile, which is created when you install the client software.
Backup backs up client data in increments calledsave sets. A save set typically
comprises all the backed-up data from a single filesystem or logical disk. Save sets
are saved to a volume(for example, tapes or optical disk) mounted in a backup
device attached to the server. Backup uses a poolto sort specific data to preselected
volumes to help manage your data and collection of volumes.
Backup maintains records of the client save sets and the volumes in a client file index
for each client and a media databaseon the server. Backup uses these records to track
the saved files and the volumes on which the files are stored. The client fi le index
and media database contain the tracking information for all data controlled by the
Backup server, whether the data is written to a device attached to the server or a
device attached to a storage node.
When Backup backs up fi les, you might receive a request to mount a writable
volume in the server's backup device. When Backup recovers files, you receive a
request to mount a specific volume by its name. To fulfill either request, you only
need to mount the requested volume or volumes in the device attached to the server.
If you back up to an autochanger, the requested volume is automatically loaded if it
is stored in the autochanger.
This guide uses the term autochangerto refer to a variety of robotic libraries,
including jukebox, autoloader, carousel, library, nearline storage, and datawheel
devices.
Backup supports many of the latest backup devices that provide the highest
performance and most reliable solutions for your network backup and recovery
requirements. Refer to theLegato Compatibility Guide, available from the Legato web
site ( http://www.legato.com), for the current list of supported devices.
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