How can I sync all files in 2 Macs using local network only?

Question

I am looking to equip a small office with 2 Macs, iMac and MBAir. I would like for all files to be synced (either automatically, daily, or worst case, on demand). The trick is that this has to be in the local network only, as these are sensitive files. There will be a QNAP NAS on the network as well if it matters.
Maybe it is possible to setup both Time Machines to look at the same folder on the NAS? Any ideas on how to make this possible?

Answer 1

Here are three ways to do it. None of the ways is automatic:
(1) Get an Acrobat.com account, and copy your files via Acrobat.com:
http://forums.adobe.com/docs/DOC-3440
(2) If you have a computer with iTunes, and you're syncing your iPad and iPhone to this computer, your PDF files already exist on the computer. In iTunes, select the device. Then go to the Apps folder, scroll down to the File Sharing section and select Adobe Reader. All your PDF files are shown and you can save the ones you want to your computer hard drive. Then import them in a similar way via iTunes.
(3) Use a Dropbox account. Install Dropbox on both your iPad and iPhone. Copy the PDF files via Dropbox.