I've used Dropbox for a long time, and it's been really useful in school (as others have noted) and for sharing files, but recently I've actually moved to ownCloud (https://owncloud.org/). I hooked a 500GB HDD into my RasPi at home, spent some time on configuration and setup, and now I've got functionally the same product, but limited in space only by how much storage I want to buy (one-time cost, obviously) and plug in instead of the 13.25GB I have on DB that I had to scrounge around for offers and promotions to get.

It's nice because I have a backup of whatever files I'd like at home instead of somewhere else, and if I were super paranoid I could make that into redundant storage, back that up daily, etc. It's a little more work but a lot more control.

If the linked post is accurate, it sounds like an absolutely horrible work environment.