The 3-2-1 backup rule is pretty outdated in the world of cloud. You could have 3 complete copies of your data in different S3 buckets, but if they're all under the same account you've lost your blast radius protection

If only there were a quick and easy way to replicate s3 buckets to an independent provider…

… on the Unix command line …

… to a cloud older than AWS…

… if only …

Wish I could upvote this comment account more. Too many people look for something new and shiny when trusty ol tools are sitting right there. :)

Inflated egress costs might make this prohibitively expensive, $80 per TB at GCP and AWS

Well having backups help, but I certainly can’t migrate my infra to rsync.net on moments’ notice (or ever since rsync.net does storage and nothing else) so my customers aren’t affected.

I don't think that technology exists. Sorry.

You replicate data to different clouds.