What does it mean when a box says my Time Machine back-up disk can't be found?

I clicked on my Time Machine icon on the Dock and a box popped up that says my Time Machine back=up disk can't be found.  What does this mean?  What should I do about it?

Have you been using Time Machine up until now?
If yes, then check that your Time Machine backup disk is properly connected and mounted. It should appear on the desktop. If it is indeed there, then open Time Machine Preferences and make sure that the disk is designated as the backup disk.
If you haven't been using Time Machine until now, check that a disk that is ~ 3 or 4 times larger than what you plan to back up is connected and mounted, and go into Time Machine prefences and designate it as your backup disk.

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