I think my comment was misunderstood.
It's easy to see why, since it was tangential to this thread. It actually had nothing to do with Backup4all.
I was just trying to point out that the point of backups is redundancy in case of data loss, and 37 backup services all using S3 means there is no redundancy. If S3 goes down, all 37 of those services go down. Again, that has nothing to do with Backup4all. I just think it's kind of scary how this amazing tangled web of computers we call the internet can all come (nearly) crashing down if only one or two of the big, centralized services goes down.
How much of the internet goes through Amazon S3? Or Cloudflare? etc. It's not uncommon to hear in the news about a big service going down and large swathes of the internet being unreachable to large swathes of people across the world.
I'm really looking forward to the decentralized web which, IMO, will be the prevalent paradigm in another 10-15 years, thanks to efforts being made in projects like IPFS (and related projects), various cryptocurrencies (such as Ethereum), mesh networks, etc.