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Backing Up files to external hard drive without repeating same files again

How can i continue to back up files onto my external hardrive without having to copy over the same thing over and over again? I usually just select all the files in my documents and then copy and paste into the external hard drive, but i have to wait for it to copy over the same files that have not been changed. Can the computer tell what files have been changed or modified and only copy those over?
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1 Solution
Use a bactch file

See the xcopy command ( which can use the archive bit to see if a file has changed )
OR THE MORE ADVANCED Robocopy program available on the WIndows resource kit CDs and on the MS site.

I hope this helps !
Another  OPTION IS THE FREE Win XP syncToy


Other great utils are there also.

Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:

Use robocopy.exe to do this


This an script example how to run robocopy.exe and update only the new files.

If you put this scritp in the schedule,  lets say, every 3 days of the week, you have on your destination copy only the new files.

robocopy will copy the folder/files and users security attributes

If you want to copy also the share folder, and its security attributes, use Permcopy

Hope this can help you


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