Regarding the system snapshot tool, I presume no tool has perfectly comply with Windows 8 up to this moment. Rollback Rx, for instance, is about to release its 10th edition which officially supports Windows 8 between the middle of January 2013. I do have Rollback Rx 9 and there are a few configurations must be kept in mind before installation. That said, the developer will not be taken responsibility if by chance any fatal hardware errors occur.