So those are all different scenarios where you might want to just say, that's it start from scratch, wipe the machine, restore and get back in business. So it's easier to just format your system and restore from Time Machine. And I need to go back to Catalina because program X, Y, Z doesn't work, well, downgrading is a really dicey process that doesn't always work, in fact, a lot of times it doesn't. But sometimes they don't work or sometimes the upgrade does work, and then you find out some application you run isn't compatible, right? And so now you're like, oh shoot, I upgraded the Big Sur. Well, Apple uses some snapshot technology that's designed to help prevent problems, or at least allow you to recover like downgrade real quick. There is one more scenario I want to highlight, a failed upgrade, you know what if you're running a MacOS Catalina or El Capitan, and you upgrade to Big Sur and halfway through something goes wrong. Time Machine backs them up, we just need to jump in and leverage that recovery. Your data might be synced into iCloud, but in order to get your Mac up and running, you need all the other bits that go along with it.
The operating system, the preference files your applications and your data. In all these scenarios, you have to bring back everything. Maybe your hard drive fails, so you go to the store and you buy a brand new blank hard drive, is blank, how do you recover from blank? You can't install iCloud on it. So you format your computer and you restore from Time Machine. Maybe you get a virus, right? Once you have a virus, even if you have antivirus software and it says it's clean, you don't really know you're clean. So what would be the scenario where we would need to restore the entire computer? - Well, hopefully, there's no scenario where hopefully you don't ever have to do this, but it does happen, right? So potentially let's say that your operating system becomes corrupted, right? So you can't even boot into MacOS, well, if you've got a Time Machine backup, you can just restore.
(chuckles) Alright, to clarify, if your computer's messed up, not if you are messed up, well, we can't fix that with Time Machine, but in this episode, we're going to learn how to use Time Machine to completely recover our system, if we just treat it as nonrecoverable, we're going to blow it away, you'll see how to use Time Machine to get the things together that you need actually boot to recovery, start that restore and get your system back up and operational in short order. I am Zach and this is Don and we're so glad to have you here, now what do you do if you're so messed up, you have to start from ground zero. (upbeat music) - Hello, welcome back to Apple Certified Support Professional, MacOS 11 Big Sur. So, what do you do if your Mac is so messed up, you have to start from scratch? Can Time Machine help us? Let's talk.
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