Time Machine won't work work with LaCie External Drive
I have a LaCie Mobile Drive and am trying to set Time Machine to automatically back up to it. I keep getting an error message "Two of the disks to back up have the same name. Rename one of the disks named Macintosh HD.” Under Disk Utility internal disks there is a disk named Macintosh HD, which is APFS (Encrypted) and one named Macintosh HD Data, which is just APFS.
I'm not the very computer literate and have no idea what is different if anything about these, they are both the exact same size. I just know not to change anything under Internal. I have reformatted the external drive multiple times and tried Time Machine and always get the same answer.
When I contacted LaCie, they feel that it is an Apple problem since the error refers to the names of the Macintosh HD files. Can anyone help me with this?
MacBook Air (2020 or later)