HI All !
Sorry for late reply,
On MacOSX, programs are stored in /Library/Preferences/Prophet-V2/save.
On Windows Vista and Seven, programs are stored in %ProgramData%\Arturia\Prophet-V2\save. By default, %ProgramData% is C:\ProgramData.
On Windows XP, programs are stored in %ProgramFiles%\Arturia\Prophet-V2\save
Creating a backup of these files is a good approach.
But be careful, altering these files may lead to a loss of user programs !