I switched back and forth between Catalina and Big Sur on my 2018 Mac mini with a 3.2GHz 6-core Intel Core i7 and 32GB of RAM using an external Samsung T7 1TB SSD. As the summer wore on, I also ...

Here’s a list of the Macs that can run macOS Big Sur: Note that the M-series Macs will not be able to run Catalina or earlier. An M-series (Apple Silicon) Mac cannot be downgraded beyond Big Sur.