[nickwoodhams]

Agreed, I am more confident with Amazon S3 as opposed to an undisclosed private server.

I like that the instructions guided you through creating a secured tar file.

I like the idea of Tar backups, but no offense to you, I just don't trust the reliability. You can't offer a resilient backup service entirely free, it just doesn't work. Storage costs money, and developers know that better than anyone else.

That being said, the actual code looks pretty simple.

Think you're on the right track here. Don't think I would pay for the service though.