Red Hat Satellite backup fails with an error 'Postgres user needs write access to the backup directory'

Issue

• Is it possible to take the online backup of the Satellite on other directories apart from /tmp and /var/tmp?

• While taking Satellite backup on other directories we get the error 'Postgres user needs write access to the backup directory'.

  # satellite-backup /backup
  Starting backup: 2018-xx-xx xx.xx.xx +xxxx
  Creating backup folder /backup/satellite-backup-xxxxx
  Sorry, user root is not allowed to execute '/usr/bin/test -w 
  /backup/satellite-backup-xxxxx' as postgres on satellite.example.com
  ****cancelled****
  Postgres user needs write access to the backup directory
  Please select a directory, such as /tmp or /var/tmp which allows 
  Postgres write access