what is backup? what are those types and where those are used?

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what is backup? what are those types and where those are used?..

Answer / shankar

back up refers to the copying and archiving of computer data
so it may be used to restore the original after a data loss
event with the help of external hard disc,network cable,usb
flash drive.. types are
1.system image backup..
2.system repair disk..

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