Backing up entire hard drive to iCloud

ljfavors wrote:

Wow, that was fast and definitive. I won't even ask why. How can I be sure my desktop and Documents are backed up? Also, is my media backed up to the cloud?

iCloud is a syncing service. Not a point in time recovery service like Time Machine.

Enable Desktop and Documents if you want them synced to iCloud. The contents of your iCloud Drive are also synced as well as your photo library, contacts, calendars etc. if enabled.

https://support.apple.com/en-ca/HT208682

https://support.apple.com/icloud

https://support.apple.com/en-ca/guide/macbook-air/apd785390d2e/mac

https://support.apple.com/en-ca/HT204264

Is it possible to back up my entire hard drive to iCloud? I was using Time Machine, but I think it died this week, and my iMac keeps dismounting the external hd that I was using to back up.

No.