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A little mishap happened earlier today and i am thinking i should have a copy of my external harddrive since 10% of it is very valuable. What is the best solution to keep two external harddrive in sync? i'll probably use one as regular and maybe use the other only to copy data. The easiest way to keep it in sync is to clear one drive and copy the other but 1T of data will take a long time.

Whats a good existing app that will keep them in sync? freeware preferred.

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3 Answers

up vote 6 down vote accepted

rsync and maybe rdiff-backup.

On Windows - robocopy (comes with Vista).

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it looks like robocopy C:\src C:\dst /mir /copyall will do the trick (but requires admin rights to access/set the security attr with copyall) -edit- to note mir will delete files that dont exist on src like i wanted. – acidzombie24 May 14 '10 at 21:28
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up vote 6 down vote

If you're in Windows, you can use Synctoy. Very easy to use IMO.

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I like this because it's so easy to use. – Vian Esterhuizen Dec 4 '11 at 21:49
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up vote 1 down vote

When I have to use Windows or when setting up for Windows users.

For hourly and daily unattended sync I really like PtReplicator which is a really easy, powerful, fast, and free.

When I am doing manual syncs, or have an external that I want to have the software and settings available on the external disk when I plug it in I use Toucan Portable. I love this one because I have several different drives for specific uses.

When I'm on my Ubuntu boxes I agree with the Grsync suggestion.

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