I have a couple of private keys that I use to administer Amazon EC2 instances.
I recently lost these keys when I did a re-install of my computer and I found out that the CD-RW I'd backed them up to was unreadable. So, I'm looking for a slightly more robust backup solution and I'm thinking about using something like Dropbox, because it uses SSL for confidentiality of transport and then my data is stored securely.
Is the risk I take backing up my keys on a service like this purely that the provider could screw up or be corrupt, or have I missed something else?
Update: The private keys have a pass phrase.