I guess this is probably fast enough that you could run it on a schedule every 10 seconds or so (at least for databases measured in GBs, not TBs) to keep a warm copy updated elsewhere. [UPDATE: maybe not, it has to hash everything, see comment here https://news.ycombinator.com/item?id=41749288#41760395]
Litestream gives you a backup in S3 within less than a second of data being committed though, plus since it records the full WAL archive you get point-in-time recovery for previous timestamps too.
Litestream gives you a backup in S3 within less than a second of data being committed though, plus since it records the full WAL archive you get point-in-time recovery for previous timestamps too.