How do I backup my Mac Desktop to iCloud?
I need to run a manual backup; not an automatic backup at a certain time but backup as of now.I need to save the backup to iCloud.
iMac 21.5″, macOS 10.15
You can run a manual backup to an external drive using Time Machine or 3rd party backup software such as Carbon Copy Cloner: https://bombich.com/
Apple offers iCloud Backup for iPhones and iPads but not for Mac computers.
It is possible to sync data from a Mac to iCloud if you turn on those options (e.g., iCloud Photos, iCloud Drive including the Desktop & Documents option). Syncing has some of the benefits of a backup (and the benefit of being offsite) but is not the same as a backup. Major differences include the fact that not everything on your Mac can be synced and the fact that if you delete something, accidentally or otherwise, there is only a limited time period (30 days in most cases) during which it can be recovered.
Also see the Apple article: How to back up your Mac - Official Apple Support
And more information on syncing in:
Set up and use iCloud Photos - Apple Support
and
Access and manage your files in iCloud Drive - Apple Support
and
Add your Desktop and Documents files to iCloud Drive - Apple Support