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Is there a way to start coping all the files from a external hard-drive to another external hard-drive automatically when it's inserted?

I don't know the drive letter of both drives before. Is this possible without me being there?

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What operating system are you using? I presume it's some flavour of Windows since you're talking about drive letters, but which version? – Scott Jul 6 '11 at 10:18
As @Scott said, I assumed Windows. Please clarify. – slhck Jul 6 '11 at 10:20
I and using windows 7 but I also have ubuntu 10.10 on my laptop. – user83241 Jul 6 '11 at 10:22
Do you want both OS's to perform this capability? – Big Chris May 27 '15 at 9:34

I think I've once used Allway Sync for exactly that purpose. It offers one-way sync and bidirectional sync for external drives.

This sync process can be triggered automatically when a drive is inserted. I guess you'd have to plug in the receiving drive first and then the source drive.

The tool is free, but with a (very generous) limited amount of files per month. Just try and see if it fits your needs!

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This would be your best option. – surfasb Jul 6 '11 at 20:25

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