Your Apple ID and your iCloud ID are not necessarily the same. Are yours?
I don't know. I'm not an iCloud user (at least, not consciously). iCloud is something I goofed with when it was first offered but didn't see any value for my simple computing requirements. If I entered an iCloud ID password, I didn't keep track of it.
However, in this case, the software isn't asking for an iCloud ID password. It specifically asks for my Apple ID password….and I do know what that is.
Hence my original query:
Assuming that, by other devices, Apple includes Time Machine and Super Duper backups I'd like to hit that delete button and get rid of iCloud once and for all. I am also assuming that, when I hit the delete button, my Super Duper and Time Machine backups should be turned off.
If I'm correct about the last paragraph, what's the correct process to restore my Calendars and Reminders?