See the documentation: https://www.postgresql.org/docs/current/backup.html
replyall of these various 3rd party backup tools use these things. Mostly it's QOL stuff that you get from a 3rd party tool. We use barman, very happily: https://pgbarman.org/
Hopefully barman has some longevity being under EDB assuming some hyperscaler doesn't gobble them up
replyBarman has been around since 2011, released under the GPL. If it does get ruined by someone, I'll replace it in my stack or fork it for maintenance myself. I'm not very worried though.
replyEDB has been in private equity(PE) hands since 2019 with out managing to ruin it so far. The ownership in PE hands seems to be pretty stable, so it doesn't look like the typical pump/dump mess you often see from crappy PE money.
Postgres is very "unix-y" in that everything is a separate tool. It has backup interfaces and commands but doesn't ship with a comprehensive backup management solution.
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