I've got too much time invested in Redhat to try
Debian ;-(
What version are you running? 5 / 6 / 7?
Version of what? I've got Redhat based on Fedora 25 is the release
number off the top of my head, and I can recheck. So I don't
understand the numbers "5 / 6 / 7".
I assumed since you said Redhat that you were running RHEL / CentOS / Scientific Linux. If you're running "25" Then that would be Fedora 25 not Redhat, while they sponsor some stuff and provide infrastructure they are not directly linked. Redhat as a desktop OS has been dead a long time.
You can use my COPR to "upgrade" to BackupPC 4.1.2 but there are some manual actions that have to be completed afterwards which is why I chose not to update anything older than Fedora 26 to v4.
Thanks,
Richard
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