I've filed two bug reports in Debian for the current version of backupPC=20
The first is an issue that makes file excludes practically unusable for the=
tar backup method .
The second is a documentation issue: it refers to /etc/backuppc/_pc_/ as th=
location for per-PC configuration files, which is incorrect .
See the Debian bug reports for details. Both have patches.
Please check my note in the BR for the first issue!