[oblio]

It's not a lot of complexity.

Add object versioning for your bucket (1 click) and mirror/sync your bucket to another bucket (a few more clicks).

Yes, your S3 costs will double, but usually they're peanuts compared to all the other costs, anyway.

Debating it takes longer than configuring it.

[nightpool]

As I understand it, Aeonflux was talking about redundant backups outside of S3, which are much more complex.

[exdsq]

Cron-ran SFTP from s3:// to digitalOcean:// ?