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<blockquote data-quote="Alwyn" data-source="post: 1872588" data-attributes="member: 153944">MOSTLY SOLVEDI checked with Apple as they had helped me to clean the 2017 iMac from Mojave and upgraded it to Big Sur.&nbsp; Apparently system files just has passwords and bookmarks (17kb).&nbsp; The lady also said that restoring from my CCC backup wouldn't change the MacOS.&nbsp; She was right.&nbsp; This surprises me because the sole purpose of setting up CCC was to ensure that, if I was unhappy with an upgrade, I could revert to the previous MacOS.The only problem is that after backing up the 2014 iMac to CCC I erased its Time Machine backup and did a full back up.&nbsp; Unfortunately, because the last backup from the CCC was 22 Dec last year it can't recognise the 'new' Time Machine and says that Time Machine isn't connected.&nbsp; In fact in the select disk pane are 2 identical Time Machines.&nbsp; I removed one and, when I started this reply it said that it would back up in 45 seconds.&nbsp; The attached shows what it says.&nbsp; I used to have 2 disks labelled Time Machine 1 &amp; Time Machine 2.&nbsp; The second one died.&nbsp; [ATTACH=full]33198[/ATTACH]</blockquote>

[QUOTE="Alwyn, post: 1872588, member: 153944"] MOSTLY SOLVED I checked with Apple as they had helped me to clean the 2017 iMac from Mojave and upgraded it to Big Sur. Apparently system files just has passwords and bookmarks (17kb). The lady also said that restoring from my CCC backup wouldn't change the MacOS. She was right. This surprises me because the sole purpose of setting up CCC was to ensure that, if I was unhappy with an upgrade, I could revert to the previous MacOS. The only problem is that after backing up the 2014 iMac to CCC I erased its Time Machine backup and did a full back up. Unfortunately, because the last backup from the CCC was 22 Dec last year it can't recognise the 'new' Time Machine and says that Time Machine isn't connected. In fact in the select disk pane are 2 identical Time Machines. I removed one and, when I started this reply it said that it would back up in 45 seconds. The attached shows what it says. I used to have 2 disks labelled Time Machine 1 & Time Machine 2. The second one died. [ATTACH=full]33198[/ATTACH] [/QUOTE]

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