Create a Time Machine backup
My new external hard drive is WD My Passport for Mac - 4 TB. My macOS is Monterey. I am getting the following message:
If you upgraded to macOS Monterey on a Mac, your existing backups are not upgraded. New backups that are created can be used only on macOS Big Sur or later.
What does it mean that my existing backups are not upgraded? Do I need to purchase a different external hard drive?
iMac Line (2012 and Later)