Root App Data After Install of a ROM or Flashing an SBF?

[eraursls1984]

If I have apps on my sd card will the settings and data be there when I reinstall it after installing a rom or flashing an sbf? E.G. I have Angry Birds on my sd, will all the levels and stars stay the same once I reinstall it after I install ApeX ROM?

I have a Titanium Backup, do I need to backup before I install the ROM or is the data already on the sd card?

 

[tom108]

backup with titanium. not all apps cache full data on sd.