Delta copying

Delta copying is a fast way of copying a file that is partially changed, when a previous version is present on the destination location. With delta copying, only the changed part of a file is copied. It is usually used in backup or file copying software, often to save bandwidth when copying between computers over a private network or the internet.^[1][2][3]

References

1. ^ http://www.superflexible.com
2. ^ http://www.2brightsparks.com/bb/viewtopic.php?t=4473&sid=fc2ef67e357fbbbfa93d703ec33b8c3b
3. ^ http://www.eggheadcafe.com/software/aspnet/33678264/delta-copying.aspx

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