Downgrading from Big Sur 2019 Mac Pro

Itconnects

Itconnects

macrumors 6502
Hello, my Mac Pro 2019 came with Catalina, but I installed Big Sur later and after a few compatibility issues, I’d like to go back to Catalina. I have a time machine back up of my system from Catalina

How do I downgrade? Isn’t this process easier since my computer came with Catalina or do I need to create a bootable drive?
 
Earlier I turned off security and allowed to be bootable from any drive at recovery mode. Was that the wrong thing to do? Or should I return the security settings to its default state before performing the reinstall.

My time machined Catalina is on a promise Pegasus HDD connected internally to my Mac Pro. Does this affect anything?
 
Itconnects said:
Earlier I turned off security and allowed to be bootable from any drive at recovery mode. Was that the wrong thing to do? Or should I return the security settings to its default state before performing the reinstall.

My time machined Catalina is on a promise Pegasus HDD connected internally to my Mac Pro. Does this affect anything?
Click to expand...
i never used a mac pro, but other macs.
you need to tell the mac pro to reinstall the drive that states: Catalina Pegasus HDD
to do this go to restart in system preferences and select that drive.
if you can find that, that is all i can do to help!
 
MBAir2010 said:
i never used a mac pro, but other macs.
you need to tell the mac pro to reinstall the drive that states: Catalina Pegasus HDD
to do this go to restart in system preferences and select that drive.
if you can find that, that is all i can do to help!
Click to expand...
Do you know if my Big Sur time machine will be deleted?
 
MBAir2010 said:
yes.
take a step back and ask yourself
what do you want your mac pro to do?
does Catalina work better than Big sur?
and go from there
personally in stick with Mojave now.
Click to expand...
If only Mojave was an option. I thought I may be able to grab some Radom files from the Big Sur time machine since it was on my Pegasus and not the OS drive but I’m pretty sure I did a second back up
 
After restoring I get this...
 

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I ended up restoring after performing first aid on all the drives. My Big Sur files still appear on the my promise time machine which is great and I managed to copy over the files I didn’t back up before. How convenient! I’m finally back in Catalina.

Now I have a disk called Update on my finder. I want it gone. What do I do? I attached a picture of its contents.
 

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I’m guessing I have to format my drive and do a reinstall.

-How do I go about formatting the two Macintosh HD drives? One is called Data

Then

-Can I restore my disk to this point on time machine, or does time machine save this Update disk as well?

-Or do I need to choose another time before this disk?
 
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