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Is there a way to automatically keep two folders in sync (or mirrored) in real-time on a Windows machine?

Does any one know of any free software / windows tool for doing this?

Cheers, Nick.

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migrated from Nov 11 '09 at 6:41

This question came from our site for system and network administrators.

What operating system? – Bryan Nov 10 '09 at 12:03
Bi-directional or Uni-directional? – Bryan Nov 10 '09 at 12:03
I assume from your question, this is on a single PC. In which case, I have to ask why would you want to do this? – Bryan Nov 10 '09 at 12:07
Yes - you're right, just on one machine. Uni-directional. One of the folders is an external Network attached HDD. The files are critical, so when I copy them there - I'd like for a backup to be made immediately with some tool that watches the folder. Sorry if the question wasn't particularly clear! – Anonymous Nov 10 '09 at 12:27
If it was a server I'd recommend DFS. For just a single PC you're probably better off going to SuperUser. – mh Nov 10 '09 at 12:35

robocopy.exe is part of the Windows 2003 Server Resource Kit. One of the switches (/MON:n) puts it into monitor mode, in which re-runs after it sees n files change. If you set n to 1, you should be able to accomplish what you are looking for.

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+1 for robocopy /mon – Bryan Nov 10 '09 at 20:33

You may want to look at using a tool such as Synctoy, Live Sync or Live Mesh, or even Dropbox. It doesn't copy the data in real-time but it's near real time and should be plenty fast since your doing it across local storage. Here's is a quick rundown review of Live Sync and Live Mesh: Dropbox has a similar ability using the SyncUSBDrive add-on feature; some info on it can be found in their wiki here

They are all free and here is the official downloads:

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SyncBack Pro has such a feature: each time a file is changed in the source directory, it will be copied to the destination, if you select the right options in the settings of the profile:

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