What if I make a mistake and I want to revert back to an older version of my site?

To ensure the ability to revert to an earlier version of your content you can use the revision option for a page. This is explained in more detail in the FAQ How do I use the page revision option?

Drupal Cloud sites are backed up nightly. If you want to restore your site to the state it was in on a previous day, send a request to drupalcloud@mit.edu, giving the hostname of your site and the date of the backup you wish to restore. Backups are retained for two months.