Apps for SharePoint are small, standalone applications intended to solve a specific business or end user need. Unlike features and solutions, apps for SharePoint can be installed by site owners to individual sites. SharePoint app components are stored in the content databases of the site collections where they are installed, in the farm configuration database, and in the Secure Store Service and App Management service applications.
All of these constructs need to be accounted for during backups and restores, and unfortunately, there is no singular procedure, although either Central Administration or Windows PowerShell can be used to perform all of the individual steps.
In order to properly back up an app, you have to follow these general steps:
Back up the content databases. Follow the procedure described earlier in this chapter, and visit the following link for additional information: http://technet.microsoft.com/en-us/library/ee428327.aspx.
Back up the farm configuration...