Synchronization/Replication file base software needed

I'm currently working on a project where I will need to move 158GB of data from a 2003 server to a 2008 server, the database software is antiquated and the whole thing involves to one big folder, the problem I'm facing is the downtime and working hours which this place can stay down, not much of a time window, so I've thought about copy the folder to the 2008 server first, before the cutover migration, however I would need a piece of software that could synchronize or replicate the from folder(2003) to destination folder(2008), this way I would have a perfect copy of such a folder on the destination server and cutover downtime would be minimal. Does anyone here know about a good software to accomplish this or maybe a better idea for better results? It would be nice also if the copying resources could use shadow copy, this wall is would even copy opened files I guess.

Thank you all.
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lcohanDatabase AnalystCommented:
"...move 158GB of data from a 2003 server to a 2008 server, the database software is antiquated and the whole thing involves to one big folder,"

What does the folder contains? Database files? And which database?
Did you considered Windows own "robocopy" utility that has compare/incremental copy capabilities?

"•Robocopy.exe: Robust File Copy Utility"

And according to this: the open file(s) copy will complete when the file is closed:
The /MIR switch tells Robocopy you want to mirror the two folders, copying all folders (even empty ones) from the source directory and purging folders from the destination if they no longer exist on the source. The /W and /R switches set the wait and retry options; in this case, Robocopy will retry each copy up to 15 times, waiting 20 seconds between attempts. (The defaults allow 1 million retries, at 30-second intervals, allowing copy operations to complete when an open file is closed, even if hours or days have passed since the command was first launched.)
jdffAuthor Commented:
I will try an app called ViceVersa, have anyone heard about it?

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jdffAuthor Commented:
By far, it was the best solution.
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Windows Server 2008

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