Despite be deprecated, the ask server is our 3rd biggest backup. Even
though the site is R/O we're still backing up the fresh rotations of
the gzipped backups every day.
To reduce the incremental space requirements, move to our plain-text
streaming for the db backup. This just needs a file dropped in /etc;
see the backup-borg role README documentation. We do this in puppet
to avoid complexity adding this deprecated service to ansible. This
then excludes the on-disk db backup dir.
Drop the bup backups while we are here.
Change-Id: Icfd81aca58b9a0dc3a3b74de04c1b00f03160327
f9184ce323