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I saw the previous comments about hovering over the disks to add or subtract them, but when I hover over the disks, nothing happens. Nothing. I've got old disks on here that I haven't used forever and can't see my current ones to do fresh backups. And there's no way to enlarge the window. Suggestions?
MicheleMontgomery’s MacBook Pro 15", MacBook Pro 13″
Refer to the list of backup disks in your screenshot. That list is scrollable. For example, position your cursor over My Passport for Mac, and scroll down.
That particular Preference pane may be the only example I know of in macOS in which vertical "scroll bars" never appear.
At least now I know you're not doing anything wrong.
I have not had a need to do this for a very long time, but try the following.
Close the recalcitrant Time Machine Preferences window.
Copy the entire line below (triple-click to select the entire line) and Paste it into the Finder's Go menu > Go To Folder… field:
/Library/Preferences/com.apple.TimeMachine.plist
Make the Finder's Go to the folder dialog look exactly like this
... and click the Go button.
A Finder window will open with that file selected. Drag that file onto the Desktop, or directly into the Trash. You will be asked for your Admin password to approve that action.
See if that fixes things. You may need to restart your Mac first.
Thanks, John, but there's no opportunity for that. I can attempt to scroll but the window doesn't allow for any movement. It doesn't widen either. And it's been that way a while so a reboot didn't help.
Yes, that SHOULD be the solution. But nothing happens when I do that. It's like a frozen screen, though the cursor is working fine. Not even the up and down buttons help. There's no functional way to scroll that list. I've never had this happen before on a mac when it wasn't just a temporary thing. This is permanent. My software is up to date. My scroll functions work fine elsewhere. I'm at a loss. Reboot doesn't help.
You're welcome Mimont. Glad to help.
I had to go back to 2016 to find what I did before: Time Machine Preferences Error - Apple Community
Scroll to the bottom of that selection of available disks, where you will find "Add or Remove Backup Disk..."
That did it! Yay! Thanks for your persistence.
Can't add or subtract disks for Time Machine backups