http://www.quicken.com/support/how-and-when-use-intermediate-version-convert-older-versions-quicken
Backups, Backups and more Backups!
Do be sure to have your backups set up properly in Quicken, both the Automatic Backups and the Manual Backups. You can find the settings in Edit / Preferences / Backup. Don't rely on the installation defaults. That might not be sufficient. Write the Manual Backups to an external USB-stick or USB hard drive every time you close Quicken. Use the "Add a date stamp to file name" option so that you have multiple backup files (not just one file that gets replaced every time). Also enable and set your Automatic backups to create a backup "every 1 time Quicken closes". Retain 10 copies. One can never have enough backups … trust me! BTDTGTS!