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<blockquote data-quote="Rod" data-source="post: 1872896" data-attributes="member: 204485">Regardless of which macOS you have on the 2014 iMac as you can see it is not readable on the 2017 iMac.&nbsp; Were you hoping to use it for data transfer or just a continuing backup of the data from your 2014 iMac?This is not something you can do with TM but you can do it with CCC.A CCC backup of your 2014 iMac can be upgraded to Big Sur in the same way you would upgrade the internal HD. ie. Boot from the clone, download the Big Sur installer, run it to upgrade its operating system to macOS 11.1 you will then have a clone of the 2014 iMac running Big Sur.You could then use it to restore files or data from the 2014 iMac to the 2017 iMac and perform ongoing backups plus it would be bootable.As for your question about TC I'm not sure, I have never used TC so I am not sure how you would erase it but i assume it's done in a similar way to an EHD.&nbsp; Really, once you have all your data on the 2017 iMac which I assume was your original intention you can use DU to erase your TM backups and make new ones for each device as required.I do this at each major upgrade of my macOS anyway.&nbsp; Some users look on TM as a sort of archive, a backup which contains data no longer on the parent device that could be restored if required.&nbsp; I consider that a bad idea but that's just me.</blockquote>

[QUOTE="Rod, post: 1872896, member: 204485"] Regardless of which macOS you have on the 2014 iMac as you can see it is not readable on the 2017 iMac. Were you hoping to use it for data transfer or just a continuing backup of the data from your 2014 iMac? This is not something you can do with TM but you can do it with CCC. A CCC backup of your 2014 iMac can be upgraded to Big Sur in the same way you would upgrade the internal HD. ie. Boot from the clone, download the Big Sur installer, run it to upgrade its operating system to macOS 11.1 you will then have a clone of the 2014 iMac running Big Sur. You could then use it to restore files or data from the 2014 iMac to the 2017 iMac and perform ongoing backups plus it would be bootable. As for your question about TC I'm not sure, I have never used TC so I am not sure how you would erase it but i assume it's done in a similar way to an EHD. Really, once you have all your data on the 2017 iMac which I assume was your original intention you can use DU to erase your TM backups and make new ones for each device as required. I do this at each major upgrade of my macOS anyway. Some users look on TM as a sort of archive, a backup which contains data no longer on the parent device that could be restored if required. I consider that a bad idea but that's just me. [/QUOTE]

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