For me, one of the main benefits of cloud-based backup is that it's off-site - so if my house burns down, my data is still safe.
That's my primary use case for Amazon Drive. I have a robust rsync of the workstations and laptops to a NAS, and then to a second (incremental-only, no delete) NAS. Works great, but if the house burns down, or if someone breaks in and steals the computers, I want to ensure there's a copy somewhere.
Don't you have friends or relatives at a reasonable distance who can set up mutual backups on each other's home servers?
If it provides them a benefit like an in-house plex server, even better.
Of course it requires you going to the bank regularly to update the backup.