For those of you who are contemplating upgrading your GENE to High Sierra when it's released sometime today, I recommend you that you wait until 10.13.3 is released. I know, I know, but Apple's new file system (APFS) in High Sierra is new and still probably has some bugs which is why I recommend you stay with Sierra 10.12.6 until 10.13.3 is released and you have done your due diligence and have confidence that APFS will not lose your important data.
If you decide to be an early adapter, back up your Sierra system with Carbon Copy Cloner v5 (CCC is well worth the cost). Then, make sure you back up important data to a HDD since APFS won't be implemented on HDDs at this time.
Will I upgrade to High Sierra 10.13.0? Yes, only on Gene to test High Sierra's compatibility with the M.2 NVMe SSD that I bought especially for helping tonymacx86 in testing the upcoming guides and Beasts. I'll disconnect the other drives as a precaution. Gene's production use will still be on Sierra 10.12.6 for the meantime.