By now, you have created a backup configuration and you might (should) test it and make sure that your app saves the data, restores it, and works without any issues.
Before you test your app's configuration, you might want to enable logging; this is done via adb, where you set the parser log property to VERBOSE:
$ adb shell setprop log.tag.BackupXmlParserLogging VERBOSE
Testing the backup feature can be split into two parts:
Testing the backup phase
Testing the restore phase
The backup can be run manually, but first, you must run the Backup Manager via the adb command:
$ adb shell bmgr run
After the Backup Manager is up and running, we can trigger the backup phase via adb and run our app's package name as the <PACKAGE.NAME> parameter:
$ adb shell bmgr fullbackup <PACKAGE.NAME>