How does the demo module work?

The demo module provides a simple one-click method to create a snapshot of a site and to restore a site to it's previous state.

When a snapshot is created the demo module creates three files: an info file with details, a sql dump of the current database, and the files in the current config active folder as a compressed tar.gz file. When a site is reset the existing database is replaced with the saved database after dropping all existing tables, and the files in the config active folder are completely replaced with those saved in the snapshot.

On reset the database is completely restored including the cache files at the time the snapshot was saved. The caches are not flushed.

The demo module leaves the user added files and images untouched. It does not create a backup of these files. Thus files and images added or removed between snapshots will be the same when a previous snapshot is reset. If the files and images are to be preserved another application or technique will be required.