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Pull request fixing this problem posted for upstream review, awaiting reply.

As noted in https://github.com/rear/rear/issues/2611#issuecomment-854916232, the issue is actually more serious than the description "If we set NETFS_KEEP_OLD_BACKUP_COPY=1 and an error/interruption after output/default/100_mount_output_path.sh occurs, the exit task will rm -rF all the content of outputfs if the umount does not happen, including the old backup" suggests. It would seem that two conditions must be met for the error to happen: error/interruption during the output stage and umount not happening. Actually, if the umount command fails (for example because the mount point is in use), it satisfies both conditions: umount will not happen and it will be caught as an error leading to program termination and the bug. So the bug is actually more likely than it seems.

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 (rear bug fix and enhancement 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/RHEA-2021:4344