Catalina and Mojave in 2 volumes on an internal SSD
I´m still running Mojave 10.14.6 on a 2018 iMac, and don´t want to abandon Mojave just yet until I´ve played around and tinkered with Catalina. My idea is as follows:
Create a new volume (not a partition) on my internal 500 GB SSD.
Install Catalina on it.
Then move, not copy, all my data (docs, Photos Libraries etc.) to the new Catalina volume.
On the Mojave volume I would leave nothing but the System and Photoshop CS6. I depend on Photoshop for my daily work, and I know it doesn´t work in Catalina. Thus my idea of splitting my internal SSD into 2 volumes. I know I could also keep a Mojave clone on an external SSD and boot from that when I need to use Photoshop.
Needless to say I shall be making clones and TM backups of my Mojave setup before I start on this!
Is creating a new volume a good idea? Or would booting from a Mojave clone be better? Any help/suggestions gratefully received! Regards, Ian.
iMac 27" 5K, macOS 10.14