>The daisy chained drives are 80GB, 160gb and 500GB containing 56GB, 
>140GB and  of data respectively.  Is that OK?

I should be referring you to the ArithmeticGuys.

56GB + 140GB + 121GB = 317GB

>What's the 500GB limit related to ...  a proportion of the size of the 
>1TB backup drive?

Rule of thumb. The TM storage drive should be at least twice the capacity 
of the data being backed up so that there will be enough room for old 
versions.


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