How to copy large number of files to external hard disk without warnings

Hi,

I am wanting to copy a large number of files from my laptop to an external hard disk. About 70 GBs to be precise. I'm just using copy + paste commands in windows. If you leave it going overnight, in the morning you can be disappointed when you see that it has stuck on a message like "do you wish to overwrite this file" with 30 GBs of files still to copy. Is there anyway to move the files without any messages. Any advice or backup software recommended would be appreciated.

Thanks.
RupertAAsked:
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tailoreddigitalConnect With a Mentor Commented:
I've used this utility for the last 10 years for just that reason (large copy processes),
http://www.pcworld.com/article/231851/ycopy.html
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oBdAConnect With a Mentor Commented:
Use robocopy (part of the OS since Vista):
robocopy "S:\ource\Folder" "T:\arget\Folder" *.* /e /r:0 /w:0 /tee /np /log:"C:\Temp\Backup.log"
If you run this a second time, robocopy will by default skip files that are already in the target.
If you use /mir instead of /e, robocopy will as well delete files in the target that have been removed from the source.
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jcimarronConnect With a Mentor Commented:
RupertA
A couple of low tech ideas.
1) Put the existing files on the external drive into a folder.  That should isolate them from the pasting.  
2) If you do not care to keep the existing files on the external HD , format the external drive to delete all the existing files before pasting the new files.
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d0ughb0yConnect With a Mentor President / CEOCommented:
Robocopy is a good tool. Another, which might even be easier, is Roadkil's Unstoppable Copier. It's great, and easy to use!
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wlacroixConnect With a Mentor Commented:
robocopy for sure
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RupertAAuthor Commented:
I actually went with the Ycopy which works great. However the other suggestions were really good too, so am going to share points.

Thanks.
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jcimarronCommented:
RupertA--You are welcome.
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