My current Time Machine drive is a 4TB HDD I've been using for...probably like a decade at this point. It's been very reliable. But being an HDD, it has the obvious downsides of noise and slowness.

2) Use Interarchy to map my S3 account to a virtual drive on my Mac 3) Tell Time Machine to use that drive as the backup drive (Or alternately I could use another backup program and point it to the S3 ...