Dropbox is a banned site in our office due to numerous security problems they've had over the years.

Here's a quick, but nowhere near comprehensive list of problems they've had:
https://en.wikipedia.org/wiki/Criticism_of_Dropbox

Our office hosts its own cloud-like setup in our own private off-site data center. No one's going to take care of your data like you would.

We DO have some multiple-encrypted (we encrypt it before it gets uploaded, and B2 also has encryption) data over at BackBlaze's B2, but it's encrypted with multiple, sequential ciphers. Paranoid? Not really given what our office works on from time to time. Our laptops aren't allowed to leave the country either. I also do keep my important docs over there, also with multiple ciphers, in case the worst happens. Medical history, important docs, etc.