FCPX downgrade - updated libraries won't open - workaround?

Hi Tom,

I managed to see the files in finder by Go to Folder and /Volumes/ and that sees CCClone -data. I think, as you suspected, it may be that the CCC has created a data volume. How can I create a CCC backup for my purposes that will be seen by MA?

In the finder on the macbook in is viewable in Finder as CCClone. In the iMac it is in the Finder as CCClone-Data. I have tried again - this time First Aid checked, erased in Disk Utility as Mac Journaled, GUID partition. and then copied in CCC - but this time I have selected Data Only..

OK Thanks Tom. I had managed to make an External SSD visible in Migration Assistant (albeit Mac Journaled) and the Migration Assistant rejected it agaid "can't migrate from a newer OS". This is consistent with the similar failure when trying to migrate directly from the Macbook.

I'll try with it APFS

As I thought - the Migrating between a drive that has BigSur on it to an iMac that has Catalina will not work. The Migration Assistant prohibits it. Is there an alternative to MA to move my user folder over without issue?

Hi Tom. Yes that is what I am doing. I found Music is a mess with tons of legacy itunes/imusic/music folders. Photos I have a separate library - not attempted to get that working yet. Fonts are all at default. Plugins in FCP are hidden away. Some of my Mail sent folders are empty. All in all it is very sub-optimal process.

headline discovery - Migration Assistant does not work for Big Sur to Catalina. I have not read of anyone achieving this. So clean installs will be hobbled by the weakness of manual migration.

This test I did was to a spare iMac so Im not confident of doing the same for my critical laptop.

Update on the problem.

I tried to do a test downgrade from my Macbook Big Sur to a clean install of Catalina on an iMac (to test before I do the same on the Macbook that is actually seeing the freeze and crash issues. This test failed because Migration Assistant does not work with OS downgrades. A manual migration is just messy and insufficient for my needs on my primary Macbook.

So I sought more suggestions and rather than risk downgrade I went for a "dirty" re-install of Big Sur. In preparation I had already removed all the likely suspects - Chrome, Keystone, 3rd Party apps. etc. None of these seemed to cure the problem. I then did a straight internet re-install of the Big Sur. 3 weeks later I have not had a crash nor freeze. I still get the fans kicking in and Console still is full of :

getattrlist failed for /Library/GPUBundles/AppleIntelHSWVA.bundle/Contents/MacOS/AppleIntelHSWVA: #2: No such file or directory

and

com.apple.xpc.launchd[1] (com.apple.mdworker.shared.0): Service exited due to SIGKILL

In Migration Assistant as soon as you select the donor drive (in my case an extenral SSD with a CCClone of my Macbook Big Sur internal drive) the assistant will check the OS on the donor drive. That will then flag that you can not migrate from a BigSur OS to a Catalina OS.

Thanks Tom,

A clan install (either Catalina or BigSur) is my intention. I was going to re-install apps anew, and drag documents across. Good point about the user - how do I migrate the User?