Assuming that you are using a Windows platform, you could just write a cmd file (aka batch file) to run various XCOPY commands
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/xcopy.mspx?mfr=true[
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e.g.
xcopy \\pc1\d$\Backup\*.* \\pc2\d$\Backup /E /I /R /Y /M
(substitute \\pc1\d$ and \\pc2\d$ for the appropriate computer and share names)
The important flag is the "/m" - essentially this ensures that only files that have changed since they were last copied are included in this copy ... in other words you will only need to copy the image across once.
If you do use this technique then I would suggest "seeding" the folder first by doing a straight forward copy of everything.
You can schedule this to run at a specific time everyday or just double-click the cmd file when you need it.
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