So I uploaded it to amazon s3 and configured direct access to the bucket via the web (a very easy procedure though somewhat technical). It cost me less than $5 to get that file to the remaining people, with little worry about service interruption.
You also get pretty good folder sharing with others and a web interface.
Personally though I've stopped paying for dropbox and might consider going back if they implement client side encryption for some users, but til then its waiting for a fast enough good enough replacement or for dropbox to implement it.
Of course, but the user was clearly taken by surprise.
I sometimes wonder if they have been to generous, it's one service I would definitely pay for if it had a lower free cap.
For backup I use backblaze, and I have about 100GB backed up across 2 computers (so $10/month) which I'm ok with. That's mainly pictures, music, documents, etc. I don't backup anything that's easily replaceable.