Help.

[iRevo]

Can i sync a particular folder on my mac to another folder on my external hard drive everytime i connect it to my mac?

 

[Weaselboy]

Can i sync a particular folder on my mac to another folder on my external hard drive everytime i connect it to my mac?

Yes, you can configure Carbon Copy Cloner to do exactly that. Setup what you want to sync then click "schedule task" and you will see an option to run upon connect. Not free though.

 

[satcomer]

Are you thinking of doing some like Sync Folder's Pro?