Tips for keyword sync between computers

Aloha all!

I'm teaching a photography class, and each week I download students' work onto the classroom computer and use Bridge to apply meaningful keywords related to discussion topics I want to pursue. I do most of this work outside of class hours. Been doing this for years, but this year, it has finally occurred to me that working in front of the classroom computer is really complicating my life. In the first place, I have to schedule my work around other classes. In the second place, it's ergonomically a nightmare. 

So, no readon I can't copy those files to an external drive and do the work in my comfy office, right? Except, the list of keywords I use gets more extensive with each assignment I give them. As we get to more advanced levels of instruction, so, too, does my need for certain examples get more specific. 

What's the best way to keep the list of keywords synchronized between 2 or more computers? And, if the answer involves Cloud storage of some form, then what's the next best option? Our institutional licensing doesn't allow us to use cloud-based storage, collections, or libraries.

Mahalo!

Tom G