Proper roles for a backup-only user on PostgreSQL

I am working on new processes and policies for my PostgreSQL databases when they are first created, and I am trying to define what role attributes are necessary for a role specifically used for backups. I have found for MySQL that the grants SELECT, PROCESS, LOCK TABLES, SHOW VIEW, TRIGGER are enough for a user to perform backups, but I can't figure out how to translate grants like this to PostgreSQL. Any recommendations, other than having to rely on Superuser?