I upgraded to PB4 yesterday and ran into some trouble when I enabled FileVault as suggested. I never used it before. Unfortunately I got a permanent beach ball and the system rebooted. I was left with “only 1 minute remaining” in terms of encryption. It’s was doing nothing and some terminal commands said 0%. It’s was stuck. After leaving it for 14 hours or so and realizing I not could use TM or install another future update until it finished (doing nothing) and knowing it never would, I restored an image using CCC prior to the upgrade. I also TM’d before the upgrade. Unfortunately for some season I did not have a High Sierra recovery volume on the CCC image, so when it transferred I still had no recovery HD. CCC was unable to create one. I gave up and decided to restore Sierra and work my way back up. I installed Sierra from a June 30 CCC image and then upgraded to High Sierra. Interesting that going straight to PB4 from Sierra there was no APFS check box but it automatically converted my HFS drive to APFS. I just started using TM a few days ago and have never been through a restore or recovery. So at this point I have a June 30 profile of my system using PB4. I decide to restore from TM to get back to yesterday. I boot into recovery mode, pop in my TM backup drive, go into TM and restore from yesterday’s TM. It tells me my drive will be erased and replaced with the restore? I’m now really confused. Before this I had thought from reading up on TM was that it wasn’t an image and it wasn’t bootable. I thought it just replaced files(system and data) with newer ones. I assumed you had to restore a TM backup to the same OS it was created on. This is why I got my system back to High Sierra before restoring with TM. And also because I had no recovery volume. Was there an easier more direct way to do this (without a High Sierra recovery volume)? I’m wiping out all the restores I did to be able to restore from TM. Spent the entire day on this and I feel like there was an easier way? --- Post Merged, Aug 9, 2017 --- Lesson learned here, I NEED to have a recovery HD backup. If I had a High Sierra recovery HD I could have used TM 24 hours ago.