Sorry to have to say this having been a long-time user or eMA, but I would
suggest looking
for another solution for your mail backup. eMA has significant problems with
Leopard, hasn't
been updated in almost a year, and John (the developer) hasn't posted here in
almost that
long (last post May of 2007). So it's apparent that if eMA hasn't been abandoned
the
development is so glacial as to make eMA an impractical solution. You might take
a look at
Entourage Email Archive X:

http://www.softhing.com/eeax/info.html

It's gotten good reviews and is kept very current.

Regards.