$Conf{TopDir} appears to be a "hardly coded variable". My understanding 
is that, in your configuration file, you can set it to any value you 
want, but that the result you intuitively expect will only be achieved 
as long as you stay within the file-system that contains the backuppc 
configuration data.

Google reveals abundant references to that topic. I had found clear 
instructions on what to do in the wiki, but can't find them any more - 
the wiki appears to have been recently improved. From memory, here are 
the 2 principal alternatives for using a directory on another file-system:

1. mount - as already suggested - your backup file-system directly at
    the mount point /var/lib/backuppc
2. do a "bind"-mount of the backup file-system
      - mount your backup file-system at the mount point of your choice,
        e.g. <backup-mount>
      - do "mount --bind <backup-mount> /var/lib/backuppc"
    to have this done automatically at boot time, add a line to your
    /etc/fstab file
      - <backup-mount> /var/lib/backuppc none bind

In both cases, set the TopDir variable correspondingly. Also make sure 
to save any data previously stored at /var/lib/backuppc before you use 
that node as a mount point.

This is really from memory: I am far from home and do not have access to 
the system with backuppc and the corresponding notes.

<big smiley> and cheers!

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