Amanda vs Homegrown

[Mike]

Well, I have spent a few days converting a client from a bunch of hand 
rolled scripts that rcp files all over the place, to amanda.  All the 
while saying that this will be better, this is good, this is how it 
should work.  Of course I couldn't complete it in a day, and there were 
issues of configuration.  So now that I am mostly complete and am ready 
to put this project away.....

The client comes in today and says "this is taking entirely too long (to 
get working), and I want a single piece of media with a full backup of 
everything and my scripts were working just fine"..

To which I say, Uhhh, I mean I was dumbfounded, stopped in my tracks by 
such a ludicrous statement.  So.....

Does anyone have some good business case stuff or other verbage of a 
paragraph or three that I can use to convince this person that an actual 
backup program is better in all ways than hand rolled scripts, and that 
a full backup on a single piece of media may look attractive, but 
actually is not???