Question on multi-user iMac and SuperDuper backups

Hypothetical question:



Let's say I have a 3TB iMac; and have created 2 users on it - my wife and me - with 2 TB for me and 1 TB for my wife.



Let's say I want to use SuperDuper to make a bootable backup, and then do incremental backups from then on.



1. Would SuperDuper backup both users automatically or do I have to backup each user individually?



2. What should the size of the external backup HDD be - 3TB or 1TB?



In case I am just overthinking all of this, do let me know :)



Thanks and cheers

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