Folder backup/sync

I was wondering if there was an application, or automation, I can create that will automatically back up or synchronize a folder to a usb drive whenever I plug it in. I am not really looking to make a compressed image, something that will just automatically replace the older folder with the newer one. I'm a musician working in garageband and want to be safe and have my recent projects to be updated automatically.

Any help would be appreciated. Thanks

Chronosync can let you do that, its a pay app but does the job very well

Once you have set-up a sync file you can use the Schedule manager to kick in a sync job when a specific volume mounts, ie your named USB key

ChronoSync | Schedule File and Folder Synchronizations and Backups Like Clockwork | Econ Technologies