How to make an application backup and restore
Applications installed on Symbian 3rd edition devices are not backed up (during device's back-up) by default. In order for an application to be backed up and later restored the following has to be done:
1) create a file named backup_registration.xml, with the following content:
<?xml version="1.0" standalone="yes"?>
2) include this file in project's pkg file, so that it is installed in application's own private folder
"backup_registration.xml" - "!:\private\<UID>\backup_registration.xml"
where <UID> is the UID of the installed application Note: more information about private folders and data caging can be found here: Data caging
3) Note that you also need to add an additional piece of XML like this to backup_registration.xml if you want to back up any files installed by your SIS file to the \private\ folder:
<include_directory name="\" >
Otherwise you will end up with an incompletely restored installation.
More details can be found in this tutorial on NewLC or in Archived:Enabling backup and restore for installed C++ applications.