VersionX is a versioning utility tool for MODX Revolution that will help you keep track of your content in Resources, Templates, Chunks, Snippets and Plugins. Every save is recorded and can easily be looked back and compared through the component.
Simply install the package through package manager. Please report any bugs or things you feel should be different to Github: https://github.com/Mark-H/VersionX2/issues
New in VersionX 2.0.0-rc1