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<blockquote data-quote="Rod" data-source="post: 1872666" data-attributes="member: 204485">Let's go back to the original question, the part about Time Machine is just confusing to me.&nbsp; When you say that the girl from Apple told you that the CCC clone would not change the macOS from Big Sur to Mojave she was right.&nbsp; You cannot overwrite a later macOS with an earlier one by &quot;restoring&quot; from a clone.&nbsp; You say that this was the point and I get that but to do it you would first have to erase and format the drive on your 2017 iMac.&nbsp; Then you could restore your data AND Mojave to the 2017 device.&nbsp; This is what Jake was saying in post #6.This was what I was alluding to in my first post, although it seemed like more work that you needed to do ie.&nbsp; Boot the 2017 iMac from the CCC clone of your 2014 iMac.Erase and reformat the 2017 iMac using Dusk Utility on the clone.Reverse clone the CCC backup of Mojave onto the 2017 iMac (you would then have a duplicate of your 2014 iMac on the 2017 iMac) then upgrade it to Big Sur in the usual way.This would have been my chosen method and you can still do that.So now you have a 2014 iMac running Mojave and a 2017 iMac running Big Sur with all of the files and data from the 2014 iMac transferred, yes?If you want a full Time Machine Backup of your 2014 iMac I suggest you erase the old external drive you used (with Disk Utility) and perform a new TM backup.&nbsp; I'm not sure why you have two but it's unimportant really.&nbsp; Your paragraph about the TM backup from the 22 Dec confuses me, I hope you are not using the same external HD to perform your CCC clone as well as Time Machine, that would be a bad idea.</blockquote>

[QUOTE="Rod, post: 1872666, member: 204485"] Let's go back to the original question, the part about Time Machine is just confusing to me. When you say that the girl from Apple told you that the CCC clone would not change the macOS from Big Sur to Mojave she was right. You cannot overwrite a later macOS with an earlier one by "restoring" from a clone. You say that this was the point and I get that but to do it you would first have to erase and format the drive on your 2017 iMac. Then you could restore your data AND Mojave to the 2017 device. This is what Jake was saying in post #6. This was what I was alluding to in my first post, although it seemed like more work that you needed to do ie. Boot the 2017 iMac from the CCC clone of your 2014 iMac. Erase and reformat the 2017 iMac using Dusk Utility on the clone. Reverse clone the CCC backup of Mojave onto the 2017 iMac (you would then have a duplicate of your 2014 iMac on the 2017 iMac) then upgrade it to Big Sur in the usual way. This would have been [I]my[/I] chosen method and you can still do that. So now you have a 2014 iMac running Mojave and a 2017 iMac running Big Sur with all of the files and data from the 2014 iMac transferred, yes? If you want a full Time Machine Backup of your 2014 iMac I suggest you erase the old external drive you used (with Disk Utility) and perform a new TM backup. I'm not sure why you have two but it's unimportant really. Your paragraph about the TM backup from the 22 Dec confuses me, I hope you are not using the same external HD to perform your CCC clone as well as Time Machine, that would be a bad idea. [/QUOTE]

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