Help finding a sync tool

I'm looking for a way to sync a USB thumb drive the computer when it's inserted for backup.  The more data I stick on this little drive the worse it would be if it got lost, and as small as they are that's a real possibility.

Here's what I'd like to find.
- Auto runs when the thumb drive is inserted
- If it's inserted into computer A backup to a specific directory, computer B a different directory, any other computer do nothing. 
- And I'd really like a popup window that tells me it's working, although that's not a deal breaker
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