[mrtg] Large peaks in graph obscure "real" data

[A.]

I'm monitoring input/output traffic on a Web server. 
Normal daily activity peaks at around 600Mbits/s but
each night, the backups create a peak of 5Mbits/s and
reduce the daily activity to a virtual flatline.  I
want to collect all the data but only graph up to
(say) 1Mbits/s.

I've tried setting MaxBytes but then the backup peak
data is ignored and doesn't show at all.  I've also
tried using AbsMax and then I'm back to square-one
with the backup peak obscuring the normal activity and
a dashed red line at my MaxBytes value.

I'd like to effictively "zoom" in on the graph to show
up to 1Mbits/s on the y-axis yet still see the lower
part of the backup peaks even though they actually
continue off the top of the page and exceed this
1MBits/s scale.

Can anybody help me to achieve this effect?

Thanks.

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