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The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.
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If the server itself is dead, you don't need a RAID controller to attach the disks to, but rather you just attach them as individual HD's to a SCSI controller. The tool reads each disk separately and then combines them to one image file (you need enough free space on a separate media to take that file). But you'd better look for a desktop PC with SCSI controller (or try connecting the RAID controller from the server to one), and not for a laptop interface, they would be much more expensive.