Hey there, that's sort of the correct way to think about it -- notably that our caching layer is high-durability, so we can keep recent writes in the cache safely. External changes to the bucket are okay! Lots of customers need to (for example) ingest data into S3, then process it on a file system, and that totally works. The only thing that isn't supported is editing the same file from both S3 and the file system simultaneously. We think this is a super rare case, and probably doesn't exist today (because there isn't anything that bridges S3 and file semantics yet).

We support all S3-compatible storage services today, including R2, GCS, and MinIO.

I actually asked about R2 to see if Regatta's pricing is any different as there's no egress fee. I should have been clearer.

btw, thanks a bunch for answering my Q & everyone else's too (except for parts where you couldn't talk about the implementation, understandably so). Appreciate it. Wishing the best.