Agreed they have to go somewhere, but render files don’t really need to be backup as religiously as project files.
If render files were in the events folder (and backup up with them), project files – sorry folders – could be a lot smaller, would not need to be on a fast drive, could live on the system disk and then be backed up with time machine or disk image – which would make it much easier to clone say your entire project folder to dropbox, USB etc.
Michael Sanders
London Based DP/Editor