I've never used regina before, but your backup settings should be saved to your Sd card. I use Go launcher, and anytime I've re-installed it, the restore backup functions as it should.
To accurately gauge how much a power drain any launcher is craeating, you have to uninstall all the other launchers you have installed. Leaving just the launcher you wish to test and the default launcher that comes with the phone. Android pre-loads a lot of things into memory for quick access, so by uninstalling it you take a possible error out of the equation.
Good luck