backup using hard drive or Time Machine
Hello,
This question actually extends from a post I made recently in which I was advised to reinstall my OS. Unfortunately I had a follow-up question but the tech who was helping me started ignoring me for some reason. Sometimes additional clarification is needed. Not all of us are tech wizards or we wouldn't have to ask anyone. I hope if anyone responds to this they are a little more understanding and tolerant. Are all Apple help support agents like this?
Anyway, because of a problem with my History disappearing when I scroll down from it the previous tech had me create a new administrator account to test if it happened there also. It didn't, suggesting that the issue was unique to my regular account. I had the option of changing everything over to a new account or reinstalling the OS. Of course I want to try reinstalling first. The instructions advised backing up my Mac first with Time Machine which requires an external hard drive. I followed the instructions up to the point where it said it wanted to first erase the external hard drive and this is where I, a non tech-oriented person, am confused. If I already have an external drive should I allow it to be erased? Should I maybe use a third drive to do this? I asked the tech but got ignored. So, with apologies for not being tech-savvy, is there anyone here who could be patient enough to explain this? I would be most appreciative.
Mac mini, macOS 10.15