what is the diffrence between the snapshot and full backup?

what is the difference between the snapshot and full backup?

while performing any activity, example: vm hardware version upgrade, or VM tools upgrade,
or performing patching on the VM server we will take the snapshot of the vm.
but what is the difference between, backup and snapshot?
please explain.
satheesh kumarAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
A snapshot is NOT a backup. and snapshots should not be used for backups.

A snap shot is a way to preserve a point in time when the VM was running OK before making changes. A snapshot is NOT a way to get a static copy of a VM before making changes.  When you take a snapshot of a VM what happens is that a delta file gets created and the original VMDK file gets converted to a Read-Only file.  There is an active link between the original VMDK file and the new delta file.  Anything that gets written to ......

The is an excerpt from my EE Article...

HOW TO: VMware Snapshots :- Be Patient
A full backup is a full duplication of all the data.  This is used for recovery from catastrophic main RAID storage data failure.

A snapshot of a VM creates a saved state, but does not include a full copy of the VM image.  You can have multiple snapshots that share the main VM data.  They are basically change logs of the VM.  These are used for recovery from state changes that may not have been desirable or for restoring back to a starting point.  These are not sufficient for restoration from catastrophic data failure, but they are useful in retaining individual VM change states.
satheesh kumarAuthor Commented:
Thanks, I am reading the a
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
do you require any further assistance, to close this question?
satheesh kumarAuthor Commented:
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