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Using OS Monterey.
All of sudden, Time Machine stopped backing up all files except those on the computer HD.
Part of my backup involves backing up an external drive. When I open settings, all the external drives are listed as "exclude these items." They're all grayed out so I can't choose the ones I don't want to exclude. The plus symbol [+] doesn't work.
iMac 27″, macOS 12.7
Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.
NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.
Do you have any of the following third party apps installed on your Mac?
• Antivirus Apps
• Cleaning Apps
• Security Apps
• VPN Apps
• Maintenance Apps
Time Machine blocking external drives
