In retrospect, I should have archived a TimeMachine backup from before upgrading to Mojave but too late now.īTW, video occasionally goes dark on monitor using DisplayPort cable and a second using DVI. So if go back to my previous video card, reformat/erase the startup disk, install High Sierra OS, and then migrate from Time Machine, HOW would I specify using an older version of backup from before 1/22 when MacPro was running High Sierra. I have a TimeMachine that backs up the entire boot SSD (startup disk) and I have backups going back before 1/22. Restore earlier Version of TimeMachine with High Sierra OS on MacPro5,1 that is now running Mojave OS I have a very stable MacPro tower that could not be updated to Mojave without a Metal-compliant video card, so I installed a Radeon RX 580 on 1/21/19 then updated to Mojave on 1/22. Many many thanks for any help or insights - totally thought High Sierra wouldn’t be too big of a leap, but apparently it was. Will restoring backups from Superduper or Time Machine make me revert back to High Sierra after I downgrade (because that’s the macOS I cloned/Time Machined)? I’m trying to figure out if I should make a clone of my current HD (running High Sierra) with superduper (to Lacie external HD) and attempt to wipe internal iMac HD and reinstall OSX Yosemite then boot using external superduper clone copy.īackup documents with Time Machine (external Lacie HD) and wipe internal drive, reinstall Yosemite and use Migration Assistant? (I only upgraded because there are a couple software apps that needed at least High Sierra). I can barely use the computer now (was relatively zippy prior to upgrade). Upgraded from Yosemite to High Sierra (Late 2013 iMac, 21.5in, 2.9Ghz, 16GB RAM, 1TB internal HD). I made a hasty decision that has ruined my computer’s processing ability and speed and lagged App load-time to minutes vs seconds.
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