Dock Your Old Drives with the Hard Drive USB Dock

"Dock any internal SATA hard drive in this USB dock to turn any internal drive into an external drive on-the-quick. If you've got a few old hard drives hanging around that you'd like to put to good use but they aren't really worth installing in your computer's innards and you don't feel like taking the time to convert that old drive into an external hard drive, this simple dock, which appears to have taken swappable inspiration from your SNES, seems like a brilliant idea. "

http://lifehacker.com/361427/dock-your-old-drives-with-the-hard-drive-usb-dock

How do I… Build and configure an external hard drive enclosure?

"Do you have an old hard drive, which still works, lying around and gathering dust that you’d like to put to good use? If you answered yes, then chances are good that you’ve thought about using your old drive as an external hard drive. Fortunately, building an external hard drive is an easy task. Since you already have the hard drive, all you need is an enclosure, a screw driver, and less than an hour of your time. Let’s take a look."

http://blogs.techrepublic.com.com/howdoi/?p=194&tag=nl.e138

SymmetricDS

SymmetricDS is web-enabled, database independent, data synchronization/replication software. It uses web and database technologies to replicate tables between relational databases in near real time. The software was designed to scale for a large number of databases, work across low-bandwidth connections, and withstand periods of network outage.

http://symmetricds.org/