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Issue is already reported to upstream
https://github.com/rear/rear/issues/663

Patch for PPC64LE already exists in upstream. See
https://github.com/rear/rear/pull/665
https://github.com/rear/rear/pull/663
https://github.com/mmitsugi/rear/commit/bf705a445172aa2d1bf13b1e97ddcb1c0f529152

This bug is valid only for s390x. The rest architectures are ok.

This is the same bug as for RHEL-6.8:
https://bugzilla.redhat.com/show_bug.cgi?id=1309597

So... Small change:

x86_64, ppc64, ppc64le - OK
s390x, aarch64         - FAIL - don't create ISO file

# rear -v mkbackup
Relax-and-Recover 1.17.2 / Git
Using log file: /var/log/rear/rear-ibm-z10-73.log
Creating disk layout
Creating root filesystem layout
Copying files and directories
Copying binaries and libraries
Copying kernel modules
Creating initramfs
# echo $?
0
#

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.