We now have a safestrap! Mind you its an ALPHA and should be used with caution there are currently NO Roms that support it but it does have TWRP. So backups are possible. Read up and download here: http://forum.xda-developers.com/show....php?t=2605648
Now that the 4.3 update is out the old thread isn't very accurate.
So I'm making this so we can talk about it!
DISCLAMER FOR TAKING THIS UPDATE: your bootloader will become perminantly locked after updating. So if you are fine with no more Roms or Kernels then update away. any rooting applications other then the one listed below will cause hard brick. any attempts to downgrade to MF! HARD BRICK
Some general info on the update rooting ROMs and such
Saferoot for rooting after 4.3: http://forum.xda-developers.com/show...8&highlight=s3
What is "Knox": http://forum.xda-developers.com/show...php?p=47800268
a good write up on the cons of 4.3 by our local CYanogenMod maintainer @invisiblek : http://forum.xda-developers.com/show....php?t=1788313