Re: Postgres DB backup is taking too much time

(This is more suitable for the pgsql-general list, you may get more/better
replies there)

There is nothing equivalent to ZDLRA in the Postgres world, but there are
certainly ways to reduce RTO. You are using replicas, and a tool that saves
WALs, so that really gets you 99% of the way there. Tools like pgBackrest
can do incremental backups, and parallel, delta-only restores, which can
wildly reduce both backup and restore times. RTO for Postgres can be
measured in seconds (e.g. Patroni handling a disk failure) to minutes (e.g.
someone dropped a table). Also see the recovery_min_apply_delay parameter.
If you give us a more specific use case / disaster scenario, we can give
more options and advice.

Cheers,
Greg