How can I omit FCPX Render Files from a Time Machine backup?
I have realised today, that OS X seems to automatically omit Render Files in the Time Machine Backup.

Apparently, Time Machine intentionally doesn't backup certain files/folder.  The file /System/Library/CoreServices/backupd.bundle/Contents/Resources/StdExclusions.pl‌​ist includes all absolute paths (globally and for each user) that TimeMachine ignores, as suggested by this article. File-patterns, are, however, not included in this file.

Note

I have examined this behaviour by comparing the two directories after a completed backup:

diff --brief -r timemachinefolder localfolder