BackupPC-3.3.1-1.el7 has been submitted as an update for Fedora EPEL 7.
https://admin.fedoraproject.org/updates/BackupPC-3.3.1-1.el7

Package BackupPC-3.3.1-1.el7:
* should fix your issue,
* was pushed to the Fedora EPEL 7 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=epel-testing BackupPC-3.3.1-1.el7'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-EPEL-2015-1279/BackupPC-3.3.1-1.el7
then log in and leave karma (feedback).

Created attachment 1004439 [details]
SPEC file for perl-rsync

I just attached the spec file for perl-rsync which is missing.

The missing perl-File-RsyncP is now available in EPEL 7 testing and can hopefully be pushed to the stable EPEL 7 repository within 2 weeks.

Please push BackupPC again to EPEL 7 testing.

BackupPC-3.3.1-1.el7 has been pushed to the Fedora EPEL 7 stable repository.  If problems still persist, please make note of it in this bug report.

After building my own SL7.1 version of BackupPC-3.3.0-2 it worked well, but after updating to the EPEL 3.3.1-1 I cannot get BackupPC to start after a reboot.
The logs show:
2015-07-01 14:20:00 Reading hosts file
2015-07-01 14:20:00 unix bind() failed: No such file or directory
If I down grade to 3.3.0 it works again.
Any Ideas?

(In reply to Bill Maidment from comment #7)
> After building my own SL7.1 version of BackupPC-3.3.0-2 it worked well, but
> after updating to the EPEL 3.3.1-1 I cannot get BackupPC to start after a
> reboot.
> The logs show:
> 2015-07-01 14:20:00 Reading hosts file
> 2015-07-01 14:20:00 unix bind() failed: No such file or directory
> If I down grade to 3.3.0 it works again.
> Any Ideas?

Solved it.
It appears that the /var/run/BackupPC directory is not being created automatically by the EPEL version 3.3.1-1 It should be created and owned by backuppc.

Note that EL7 is systemd, so you should have:

%if 0%{?fedora} || 0%{?rhel} >= 7
%global _with_tmpfilesd 1
%global _with_systemd 1
%endif