How to take backup of code before Sandbox refresh in Salesforce?

1. MavensMate - http://www.infallibletechie.com/2015/12/mavensmate-forcecom-ide-installation.html

2. SVN

3. ANT - http://www.infallibletechie.com/2014/06/ant-setup-for-salesforce-migration.html

4. Eclipse - Force.com IDE - http://www.infallibletechie.com/2015/07/how-to-install-forcecom-ide-for-mars.html

Cheers!!!