this package seems to have new commits in its VCS but has
not yet updated debian/changelog. You should consider updating
the Debian changelog and uploading this new version into the archive.
Here are the relevant commit logs:
Author: Jonathan Wiltshire <email@example.com>
Date: Sun Aug 18 18:17:41 2019 +0100
Update watch file for BackupPC 4 series
In the 4 series, the makeDist script fills configure.pl with
a static list of binary and library files to be installed. Without
this the configure step fails.
The tags as published on GitHub do not include this additional step,
only the formal release tarballs. Therefore switch to those.