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ONE HUGE EXAMPLE....

You are running an OS and you run a VIRUS SCANNER... You update the virus scanner & there is a BUG that kills off you rebooting back up & you are left with going to see the computer tech...
[Which actually did happen a few yrs ago with one virus software vendor's update]
NOW using cloning with VIRTUAL MACHINE you could have 2 or more of them and update one and if there is a BUG you could just delete the messed up clone that you updated & with the BUG it messed up your new clone... THUS you deleter the clone & fire up one of the other clones you created BUT DID NOT UPDATE YET.... And maybe wait until there is a fix for the problem that when you update the bug messed up the OS... AND save yourself the big huge tech visit & shelling out hundreds of $$$ for a El-quick computer fix...