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RAID 6 provides the most fault tolerance of any standard RAID disk arrays
(RAID 0, 1 , 5, 6, and RAID 10).
If any two disks in a RAID 6 array fail and are removed, then two new blank disks can be installed and no data has been lost.
RAID 1+1 or most other "layered" RAID systems can provide more fault tolerance than RAID 6, tolerating the failure of any 3 disks.
Some experimental non-standard disk arrays can provide more fault tolerance with less overhead, such as the parchive system.
Nearly all distributed file systems and distributed version control systems can be set up so that if one machine is completely destroyed by fire, all the data can be recovered from a backup machine in another building.
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