(Although my bill this month won't be that cheap haha)
The advantage is that it just charges you for what you use, and the costs aren't that expensive, I think it's something like 0.15USD/GB, there's the added benefit that it's cloud based, so it's "perfectly" redundant. I use it solely for backups, not for serving images/files, although it can be used for this.
I definitely recommend it to people who want to have a reliable backup solution, there are APIs available that make backing up absolutely simple.
