raft

Litestream author here. The default configuration is to replicate any new changes every second to S3. This is mainly a cost issue though. S3 doesn't charge for ingress bandwidth but it does charge $0.000005 per PUT request. If you have a non-stop, continuous stream of writes against your database then that's about $12/mo. In practice, most people don't have a continuous stream of writes. Michael Lynch, for example, wrote a post about how he pays $0.03/month for his Litestream replication[1]. I've worked with Raft a lot in my career. I wrote the original etcd Raft implementation (sorry!) [2] and even wrote a visualization explaining Raft[3]. It's a great tool when you need really high durability guarantees but I'm not convinced it gives you better availability guarantees than a single node that can quickly be recovered. [1]: https://mtlync