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<blockquote data-quote="MacInWin" data-source="post: 1833249" data-attributes="member: 396914">The fact that two drives have the same name means the restore didn't work properly. I would bet that you named your boot drive &quot;Steve SSD&quot; when you installed Catalina and then Catalina created two, one named &quot;Steve SSD&quot; and the other &quot;Steve SSD - Data.&quot; But then when you rolled back to Mojave, you restored what had been &quot;Steve SSD&quot; (Mojave version) and that probably went to the &quot;Steve SSD - Data&quot; drive. So now you have two named the same and TM gets lost. The key was your statement: The problem TM had in the failures was, I would guess, it was trying to restore &quot;Steve SSD&quot; (the Mojave one) but there was already a volume named &quot;Steve SSD&quot; (the Catalina one). At this point TM now cannot back up Steve SSD because there are two of them, as it is reporting. That is actually a good thing because the most current TM is still valid and not mucked up by the mess on the drive.So, as I said in Post #2: If the current TM backup is good, that approach will solve the &quot;which Steve SSD is the right one&quot; issue and recover all your drive space into one Container/Volume again.I don't think what Pine Man suggests will work because you have rolled back to Mojave and have overwritten the Data drive with the duplicated Steve SSD, but it doesn't cost anything to check. Just don't be surprised if there is no longer any reference to Data anywhere. Good luck with it!EDIT for clarity</blockquote>

[QUOTE="MacInWin, post: 1833249, member: 396914"] The fact that two drives have the same name means the restore didn't work properly. I would bet that you named your boot drive "Steve SSD" when you installed Catalina and then Catalina created two, one named "Steve SSD" and the other "Steve SSD - Data." But then when you rolled back to Mojave, you restored what had been "Steve SSD" (Mojave version) and that probably went to the "Steve SSD - Data" drive. So now you have two named the same and TM gets lost. The key was your statement: The problem TM had in the failures was, I would guess, it was trying to restore "Steve SSD" (the Mojave one) but there was already a volume named "Steve SSD" (the Catalina one). At this point TM now cannot back up Steve SSD because there are two of them, as it is reporting. That is actually a good thing because the most current TM is still valid and not mucked up by the mess on the drive. So, as I said in Post #2: If the current TM backup is good, that approach will solve the "which Steve SSD is the right one" issue and recover all your drive space into one Container/Volume again. I don't think what Pine Man suggests will work because you have rolled back to Mojave and have overwritten the Data drive with the duplicated Steve SSD, but it doesn't cost anything to check. Just don't be surprised if there is no longer any reference to Data anywhere. Good luck with it! EDIT for clarity [/QUOTE]

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