From Leading Software Maniacs, LLC:
Spresso is a software application that manages project digital assets (files and folders) as a series of version backups. Spresso is designed to be extremely easy to use and intuitive (especially for occasional use). There are currently two editions available on either Windows or OS X: Decaf (no cost, feature-restricted but completely functional) and Americano ($15 end user license). For more information visit us at http://www.VersionItWithSpresso.com.
No trial limit, use it free forever. Limitations include: Only one active user project can be backed up at a time. Your user project total size to save as a version backup can't exceed 100 MB. A maximum of nine version backups per user project. Can't version backup to an external, removable disk. Limited version numbering, date, and time formats.