incompatibilities with newer Postgresql

So, I am not sure which version started this problem with backing up 
PostgreSQL.

   | psql stderr: ERROR:  function pg_start_backup(unknown) does not exist
   | psql stderr: LINE 1: SELECT pg_start_backup('amanda-1703142252')
   | psql stderr:                ^
   | psql stderr: HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
   ??! Failed to call pg_start_backup

I believe the only change needs to be pg_backup_start instead of 
pg_start_backup. The same change in order for pg_backup_stop. See table 
9.92 at https://www.postgresql.org/docs/current/functions-admin.html