Partioning an external SSD Mac OS
Need to format (erase) current external 2TB external SSD drive and partition drive. My intention is to allocate three partitions: 1 - Allocate one large sector for backup of my iMac 2 - Allocate another sector for backup of my MacBook Pro and, here's the question: 3 - Is it advisable (or NOT advisable) to also allocate a sector specifically for installing a full Mac OS (El Capitan) on a third sector? Is my plan advisable or not advisable? Thanks in advance for advice (please keep answers "specific" to my "specific" question.