I was about to set up Postgres backups with pgbackrest very soon. It looked like the most mature solution for my use case. What I was aiming for was continuous backups to an object storage provider, without a central DB server but the backup tool directly installed on the Postgres server.

I'll have to look at the alternatives again, I think that was mostly WAL-G and Barman. It looks like Barman doesn't support direct backup to object storage, unfortunately. And I find the WAL-G documentation very confusing. What I'm looking for is WAL streaming and object storage support, to minimize the amount of data that can be lost and so I don't have to run my own backup server.