The only thing with which I differ is Rita's leaving her external HDD as a single partition.
In one of her other threads I suggested that since it's so big, 1 TB compared to her 120 GB internal SSD, she make 5 x 100 GB partitions and 1 x 500 GB partition.
That will leave her space to potentially back up five different OSs in the small partitions plus run Time Machine or do whatever else comes up in the big one.
No argument, but given Rita's penchant for overthinking, I thought it better to keep it as simple as possible with fewer options to create possible confusion on her part. I would hope that eventually she would be willing to give up Sierra and then the external drive could be completely devoted to Time Machine as it should be.
