what size disk needed for backup?

[jed]

Actually I just remembered MM1 has in internal with 50GB that can be used for BU (other 30GB for windows partition). The boot volume for MM1 is a 500GB hd of which 155 is being used. 55GB (at least) of that is crap that doesn't need to be backed up, so really only 104GB is being used.

Allowing for 50% expansion over time that would mean I need 150GB space. Maybe I can use 50GB of MM1 internal for backup, and another 100 can be used on MM2's internal?

ATM MM2 is only using 13GB of 160GB, and even allowing for 100% growth it only needs 26GB. But I could round that up to 60GB and leave the remaining 100GB for MM1.

So on MM1 I could have 50GB & 30GB partitions on the internal. One for backups the other for Windows. On MM2 I could have 100GB and 60GB partitions. One for the 2nd part of MM1 backups, the other for MM2 backups.

Too complicated?