Why ReaR shows "ERROR: The mkrescue workflow does not work for the BACKUP_URL scheme 'iso'" ?

Solution Verified - Updated -

Issue

  • rear mkrescue fails with message.

    Proceed regardless that 'mkrescue' could be destructive with a 'iso' 
BACKUP_URL ?
(default 'No' timeout 300 seconds)
ERROR: The mkrescue workflow does not work for the BACKUP_URL 
scheme 'iso'
Aborting due to an error, check /var/log/rear/rear-shslisppapp01.log for 
details

  • rear recover fails with when booted with ISO generated after rear rescue.

    ERROR: Backup archive 'backup.tar.gz' not found.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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