what size disk needed for backup?

[jed]

Actually I think I agree with your approach of more than one BU disk for the 2 Mini's....
I was planning to back-up MM1 via Wifi to a central storage point on MM2 but I imagine this will be painful...
I recall that I have an old enclosure (not used much over the years) that has a hardly used 80GB hd!

I'll connect this enclosure to MM1 via USB2 (FW400 is used by boot disk) & use it's 80GB for part of the 150GB required.
The remaining 70GB will come from the 80 internal on MM1.
I will move the Windows partition currently on the internal of MM1 to MM1's external (500GB) boot volume.
(LT I'll prolly buy a 320GB or 500GB disk for this external enclosure!)

I will proceed with purchasing an external FW800 enclosure + disk for MM2.
This will become the boot volume for MM2...
Then I will allocate 80GB of MM2's 160GB internal towards a backup volume for MM2!

That's a bit better inst it?!