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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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that way, if you need to restore, you only need last nights differential tape and the full backup tape (for files that havent changed since the last full backup)..
using incremental backups means that you do a full backup, then every night do an incremental, but that means it only backs up the changed files since the last incremental, so you may need all your tapes to do a restore.