After installing local_sandbox, the plugin doesn't do anything until it is configured. To configure the plugin, please visit Plugins -> Local plugins -> Sandbox.
There, you are able to define on which days and when on each day local_sandbox should restore the courses.
You also define the directory where the course backup files to use for course restoring are. local_sandbox takes every file in this directory with a .mbz filename extension, takes the file's name, searches for a existing course with a shortname equal to the file's name and finally, uses the course backup file to restore / reset this course.
Additionally, there is an option to set the course start date to today instead of setting it to the date saved in the course backup file. Use this option if you need to provide playground courses in Moodle which pretend to be up-to-date.
As local_sandbox acts automatically, it can inform you by mail when failures or problems occur.
See README file for details.