How can I keep a clone of a folder? I have a folder with Docs in on a Time Capsule, I would also like this same folder to be in Documents on Mac.

I want both to update whenever a file is changed or added.

Do you know of an automate command or a piece of software that will do this without me having to initiate it manually.
I Just found SynkPro with a google. Not used it but it says it can "sync your home and work computers—even if they're not connected—by syncing them both with an external hard drive serving as a "shuttle" for your data."