I upgraded from Sierra to High Sierra to Mojave and thus converted from HFS to APFS. It seems that this is causing me problems (locking up Finder, Disk Utility freezing during scans, Steam client freezing due to empty directory presumably based on research). Now I cannot even perform a Time Machine backup due to "Time Machine could not create a local snapshot to backup from" error message, even thought I have a ton of free space. I've read that APFS is not reliable. I may be wrong to blame all of these problems on APFS, but I figured I start there and try to eliminate that as a possible cause. I thought I'd try wiping the disk clean and reformatting with the latest version of the installer, hoping that it lays down a solid/clean file system structure, which might be more reliable. I have a classic Mac Pro, with a Kingston HyperX Predator AHCI mounted via PCIe adapter. I'm using a non-flashed RX 580 video card. I'm also at 141 boot ROM (I know I'm at least behind from 142, but is there a newer version?). I'd like install Mojave from scratch, but not sure if I can due to non-flashed video card. Can I simply create a Mojave installer disk, select it from "Startup Disk" and reboot to start the installer and install a fresh version on the AHCI drive and restore from backup? What issues might I encounter in this plan? Thank you.