RAID 0, Striping without parity, high performance no fault tolerance, RAID 1, mirroring,  duplicates data for fault tolerance but requires twice the disk space, RAID 5, striping with parity , fault tolerance most redundancy 3 disks, RAID 10, requires at least four physical disks and a RAID compatible disk controller. Whenever data is written to the server, it is written across several disks at the same time., incremental backup, new files and files modified last back up, full backup, all selected data , differential backup, all data modified since last full backup.

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