Always have a backup.
BackWPup is a great (free) plugin that's super-easy to use and setup automatic backups to Dropbox and other Cloud storage services. I use it on all my sites and highly recommend it (Multi-site compatible as well).The following was originally posted by a Volunteer moderator on the WordPress.org forums, but they are great links worth keeping a copy of for later reference: You need to start working your way through these resources: Additional Resources: