OS X V10.6 Snow Leopard :: Any Way To Back Up In Real Time To An External (AppleScript)?

I can't risk data storage in the clouds due to the possibility (however remote) that someone's personal info might get compromised. Nor can I risk the cloud being down and not being able to access files/date when needed (which can sometimes be at the strangest of times).I have several iMacs integrated wirelessly. Every time we (I) update a doc, it needs to be manually transferred to other computers for staff who will need it. That's no big deal. What is worrisome is if a recent version of a doc were to get corrupted due to a HD failure, a corruption on an iMac, or whatever else.  We all have TM and Super Duper clones that are scheduled regularly.What I'd like to be able to do is simultaneously have docs backed up on an external in real time, as they are saved on an internal.Unless I'm missing something I can't find, it seems the only way to do this is to save to the HD, and then save to an external. That seems like a lot of manual redundancy, and invites forgetfulness.So all being said, is there an Apple Script out there anyone is aware of that would tell the iMac to automatically save a copy of every file that is modified to an external, so that the external is a "current" version of the internal for data retrieval purposes?