Hazel rule for deleting OmniFocus backups (without deleting them all)

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I was wondering why my Dropbox was 96% full, so I ran Disk Inventory X to see what was going on. Amongst other things, I found that I had a giant 2GB folder full of Omnifocus backups.

This great tip by Christopher Mackay allows you to use Hazel to retain a decent amount of backups whilst keeping the folder size down.