Radio can keep a backup of your weblog posts, stories, templates and preference settings. Every night, Radio will back up new or changed data, and optionally upstream it to the public server. You can use the backup files to restore your data using a fresh installation of Radio.

In Nightly Backups, select the second box, "Check this box if you want to upstream your backup files to the public server." The first item should be selected as well.

By upstreaming your files to the public server, you are protecting yourself in case of a hard drive crash.