I've no idea what the part about replication to a local file is. Postgres doesn't set up any replication by default. And if you're getting corruption in your d

I've no idea what the part about replication to a local file is. Postgres doesn't set up any replication by default. And if you're getting corruption in your database on low-end storage, that storage is simply broken. The database can't do anything if your storage system lies to it, or writes different data than what you give it. It is possible to configure Postgres in a way that leads to data corruption when e.g. the power goes out, but that is an option with a big warning that you should never use outside some specific circumstances. The Postgres defaults don't corrupt your database if your hardware works correctly (absent some pretty rare bugs in Postgres itself).