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<blockquote data-quote="MacInWin" data-source="post: 1863916" data-attributes="member: 396914">Welcome to the forum.I take it you are running Catalina. Are you doing anything, or have you done anything, to rename the volumes that Catalina has created? When Catalina reformats the boot drive it creates two Volumes, one named &quot;Macintosh HD&quot; and the other named &quot;Macintosh HD - Data&quot; and then the operating system, including TM, then merges the two separate volumes into one unit, named Macintosh HD. When TM runs, it expects to see the two separate Volumes and backs them up together to preserve full integrity. But if you, or some application you have, messes with the naming protocol, I can see how TM could get confused as you say. To keep us from just repeating stuff you have already tried, how about telling us what you have already done that didn't work? That way we won't tell you stuff you already know. Also, do you have any third party applications running that &quot;enhance&quot; or &quot;streamline&quot; or &quot;improve&quot; or &quot;protect&quot; your Mac? Any Antivirus software? The new drive format that came along in macOS High Sierra, APFS, is very different from the previous format and not many of these type utilities have caught up with the changes. Finally, can you take a screenshot of Disk Utility that shows these duplicated Volumes on the drive? That may help in diagnosis of what is going on.</blockquote>

[QUOTE="MacInWin, post: 1863916, member: 396914"] Welcome to the forum. I take it you are running Catalina. Are you doing anything, or have you done anything, to rename the volumes that Catalina has created? When Catalina reformats the boot drive it creates two Volumes, one named "Macintosh HD" and the other named "Macintosh HD - Data" and then the operating system, including TM, then merges the two separate volumes into one unit, named Macintosh HD. When TM runs, it expects to see the two separate Volumes and backs them up together to preserve full integrity. But if you, or some application you have, messes with the naming protocol, I can see how TM could get confused as you say. To keep us from just repeating stuff you have already tried, how about telling us what you have already done that didn't work? That way we won't tell you stuff you already know. Also, do you have any third party applications running that "enhance" or "streamline" or "improve" or "protect" your Mac? Any Antivirus software? The new drive format that came along in macOS High Sierra, APFS, is very different from the previous format and not many of these type utilities have caught up with the changes. Finally, can you take a screenshot of Disk Utility that shows these duplicated Volumes on the drive? That may help in diagnosis of what is going on. [/QUOTE]

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