NEW: Non-root working mode is now supported in 2.0+, but still in early stage. It currently lacks auto-hibernation due to privilege restriction. Try “Hibernate All” shortcut (widget) for convenience. On Android 4.1+, an accessibility service can be activated to automate this manual procedure, thus eliminate all the clicks.
Greenify NEVER EVER collects your personal data despite the capability of accessibility service, it just takes advantage of it to automate things.