Time Machine
Have started receiving the message "Backup Not Completed Time machine couldn't back up to (name of my external drive)" where I've been backing up for a couple of years. When I click on "details" I get the message "An error occurred while preparing the backup"
I'm running macOS Monterey 12.1. Was receiving the error a couple of months before upgrading to Monterey. I have a manual workaround using terminal. After doing the workaround/cleanup Time Machine will function normally for a period of time. The period used to be a couple of weeks, but not seems to be every couple of days.