Time Machine back ups missing on MacBook Pro
I have always had my external hard drive attached to my iMac and it frequently backs up. I don't get error messages saying backup was not completed (I am familiar with those messages because I have had those backing up a MacBook Pro). So as far as I'm concerned my iMac is regularly backed up. Recently the iMac died. So I have purchased a new MacBook Pro as a replacement and am going through the set up process. I attach my back up drive and low and behold it tells me the last back up was in Jul 2o22.... Surely this cannot be right? Why would this have happened? Is it just likely to be some error in descriptions or not and I have lost everything from Jul22 onwards? The main things I wanted to have retained are my emails and music files. All else is backed up to iCloud. If I set up new MacBook Pro of the Jul2022 back up will and that syncs to iCould would it overwrite and delete later versions or would iCloud update the new MacBook Pro with the latest data and versions?
[Re-Titled by Moderator]