saving entire computer on cloud

You cry another service such as Crash Plan.

be advised restoring a computer from a cloud should be a last resort and cloud backup should be secondary to local backup on an external drive or alternate partition. A cloud backup requires network connection and network bandwidth and can take hours or days where a hard drive can often restore in a fraction of the time, and can also restore a computer to a bootable state in the event of a catastrophic loss.

Use Time Machine to back up or restore your Mac - Apple Support

Mac Backup Software | Carbon Copy Cloner | Bombich Software

Apple has iCloud backup for iOS devices but doesn't offer an iCloud backup service for computers. It is possible to sync data to iCloud via Apple menu > System Preferences > iCloud and that includes an option to sync the Desktop and Documents folders (click Options in the iCloud Drive setting in System Preferences > iCloud).

There are dozens, I just was recommend CrashPlan and installed it on one of my clients servers (which was not advised by CrashPlan btw) but I was able to offset the time when the network was not otherwise in use to do this.

I would NOT recommend doing that.

Why are you objectionable to local backups?

Cloud backup of your entire computer is a really bad idea.

Unless you pay for really fast download AND upload speeds, depending on how much data you have have on your computer, this could take days to upload.

Local backups with external drives are much faster and more convenient.

Also not intentionally risking off site server storage of ALL your data to future possible security risks.

This is a bad idea.

Plus, any data you push to the cloud, you WILL lose any organisation of your data that you performed on your Mac!

Mozy is another option (with the same caveats). I use it and it works well, including with Photos. Online Backup Storage and Software for photos, music, and docs