Fix for incorrect "not enough storage" message when backing up iPhone
Just got off a chat with Apple Support and it turned out that my Mac was incorrectly categorizing time machine snapshots as used storage. Use this terminal command to clear them: tmutil thinlocalsnapshots / 999999999999999 4
To be clear, the issue was that my iPhone wasn't backing up to my Mac because of an error that stated my Mac didn't have enough storage space for the backup (which it clearly did). Hope this helps someone!