My life is in my Dropbox (and yours should be too)
blog.schneidmaster.com
blog.schneidmaster.com
A. You will always have internet access.
B. You will always have unlimited internet access.
C. You will always have very fast internet access.
D. Dropbox will always be online when you are.
I stopped using Dropbox 3 years ago for these and other reasons. Backup to a local external USB disk, and backup to an offsite file-server that you also control. You only need incremental backups, so your throughput is low.
> backup to an offsite file-server that you also control
This doesn't help with problems A, B, or C in your list. It's not like Dropbox uses an order of magnitude more bandwidth than an offsite fileserver. And in that case, I'm depending on my fileserver host to continue to exist.
I'd also be relying on my own ability to configure and maintain a secure fileserver and keep it up-to-date with security patches, etc. While I can certainly do that, my time is worth money to me. I'd rather pay $10/mo to people who do it full-time for a living.