I would like to point out that Tigris has this feature called shadow buckets which, with one extra flag: `--shadow-write-through` also writes back to the source

I would like to point out that Tigris has this feature called shadow buckets which, with one extra flag: `--shadow-write-through` also writes back to the source bucket. So if you're worried about reliability, or simply want to use two providers for redundancy like I wanted, you can use this feature. I just setup a bucket on Cloudflare R2, made it the shadow bucket for Tigris, and now whatever is added to the Tigris bucket, is also immediately replicated to R2.