MartinL:
Surely re-pointing all the generic clocks isn't necessary, as all clock sources: XOSC, XOSC32K, OSC32K, OSCULP32K, OSC8M and DFLL48M, that don't have their RUNSTDBY bit set are automatically switched off in standby mode anyway.
I agree that the sources are switched off, but I was unsure if any peripheral was pointing to my "run in standby" clock generators, which would increase power consumption even if said peripheral was switched off.
Plus, it is recommended on the "Atmel AT06549: Ultra Low Power Techniques" application note chapter 7 (: