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Rhel 7 has failover backend, which is used by several our customers. It was added by downstream patch to CUPS, since CUPS upstream did not want to add it. I have preliminary agreement with cups-filters upstream, but I was stuck in licensing issue and forgot about it after that because other issues came up.
To sum it up, failover backend is not in RHEL 8 now nor in Fedora and needs to be added.

Created attachment 1690542 [details]
Failover backend patch

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: cups security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:4469