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Edited

here is my problem:

I have a file A (10GB) and a file B (10GB).

File A and B are slightly different (diff is around 500MB).

I want to the file A to be exactly as B as fast as possible. One obvious solution is

$ cp B A

Is there any faster solution?

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  • The type of backup your looking for is a Differential Backup there are tons of software solutions to acomplish your goals.
    – Ramhound
    Jul 9, 2014 at 12:34

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