FYI MacOS Catalina may break your backups if configured from /

[DeeeeLAN]

I was backing up my /Applications/ and /Users/ folder so I had the following for my filter file:

+ /Applications/***
+ /Users/***
- /**

This worked great, but macOS Catalina split all user data to a separate volume and made the root volume read only. As a result, those two directories in root are something called a firmlink, while the actual data is at /System/Volumes/Data/. Modifying my source path to be /System/Volumes/Data/ instead of / fixed the issue for me and I am up and running again, but it is something to be aware of. I believe that if you are attempting to back up additional directories, this could get in the way. Just make sure to grab the user data from the subdirectory where it is mounted and everything should work.