automatically copy files to second drive

[ZMacintosh]

Im trying to find a way within OS X without third party plugins if at all possible.

I have a mac mini with a thunderbolt Pegasus 4 drive system that is shared across the network.

what i'd like to happen is anytime files are added or changed they get duplicated to a secondary drive that isn't shared on the server to keep the files uptodate and back-up.


would a time machine solution but the only reasonable way to perhaps manage this?


thanks