I have spent the past three days trying to back up my mid-2012 MBP and gave up a few minutes ago. Up until now, I have not used my MBP and just used my iPhone for whatever reason so I've come to the conclusion that my external hard drive won't work with the BETA software. Am I right? If not, what can I do fix it. I thought abut calling Western Digital tomorrow to see what they say but I am pretty sure it's my MBP's BETA OS. Should I report this in the feedback app? Thank you.