[Satellite 6] Incremental backup fails with an error message ''Provide a valid previous backup directory''

Issue

• While running incremental backup of the Red Hat Satellite server, it fails with error Provide a valid previous backup directoryas displayed below:

  # satellite-maintain backup online --incremental <path to incremental backup directory>  <path to full backup directory>
  
  Prepare backup Directory:
  Creating backup folder <path to full backup directory>/satellite-backup-2022-xx-xx-xx-xx-xx
                                                                     [FAIL]
  <path to incremental backup directory>/*.snar files unavailable. Provide a valid previous backup directory
  Scenario [Backup] failed.
  
  The following steps ended up in failing state:
  
  [backup-prepare-directory]