Remote Backup Software

Hey everyone, I am in charge of IT for about 8 different small networks that have about 10 servers between all 8 of them.  I am looking for some good software that will allow me to backup/sync files from all of these locations to a server I have in a different remote location so that we can have good remote backups.  

I don't need to backup images of each server, I just need to back up the file shares from each of these servers.  (totaling around 300 - 400 GB)

The software needs to be low cost ( I have looked a symantec but they are two expensive).  

I have looked at free programs like Rsync and robocopy but they resend the entire file if any changes occur, I would like it to only send the changes to the remote location.  

I have looked at FolderShare by microsoft but there are limitations to how many files you can send but besides that I liked how it compressed the files before sending them and how it only send the changes across.  

Also so you know all 8 of these locations are linked together via hardware VPNs.

Finally, I would like this software to be configured that it can either copy changes over all of the time or wait until night time to make the changes.  

Any help would be much appreciated.

Thanks
sevenpeaksAsked:
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Hedley PhillipsOwnerCommented:
"I have looked at free programs like Rsync and robocopy but they resend the entire file if any changes occur, I would like it to only send the changes to the remote location.  "

Rsync can only sends the changes.

Look at this question/answer

http://www.experts-exchange.com/Storage/Backup_Restore/Q_23836725.html
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noxchoGlobal Support CoordinatorCommented:
Drive Backup 9.0 Server Edition: www.drive-backup.com
It can backup files using VSS (for locked files) via VPN. Low cost, good support and simple interface. Have a look on trial version. Contact their quick support with any question.
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ai_ja_naiCommented:
Agree with Mr-Madcowz. Rsync will transfer just the changes. And it will compress the transfer with the -z option.

Run your tranfer script with cron, if you would like a scheduled transfer.
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ai_ja_naiCommented:
try rsync as stated above with  --no-whole-file option, if you are concerned about transferring just deltas
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sevenpeaksAuthor Commented:
Thanks, I didn't know Rsync could do that.  I am going to try to implement that soon.
Thanks again for your help everyone.  
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