Thanks to Yuval Kogman <nothingmuch@woobling.org> for the patch.

I.e. document tmpdir.

The handler has been heavily broken for a while.
It clearly lacks a maintainer.

Thanks to Olivier Berger <oberger@ouvaton.org> for the patch.
(Closes Redmine bug #3443)
(Closes: #641120)

Detected by Lintian's hyphen-used-as-minus-sign check.

when=XXX did work already. This patch allow to write this with spaces around the
equal sign - as in every other backup.d/ file.

Thanks to Olivier Berger for the patch.

cut is in /usr/bin actually.

Now that there's some removal of increments for old fulls, we can keep fulls for a longer time, for instance 1Y which becomes default