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In rereading this i'm noticing that you are actually suggesting alternative usage:

backup/clone

snapshot/restore

Correct?

It seems like backup and snapshot are kind of interchangable.  This is quite confusing, perhaps we should refer to them as:

partial-snapshot

whole-snapshot

or something along those lines that conveys that one is a differencing image and one is a copy of the entire object?

On Jul 20, 2011, at 12:01 PM, Chuck Thier wrote:

> At the last developers summit, it was noted by many, that the idea of
> a volume snaphsot in the cloud is highly overloaded.  EBS uses the
> notion of snapshots for making point in time backups of a volume that
> can be used to create a new volume from.  These are not true snapshots
> though from a storage world view.  Because of this I would like to
> make the following proposal:
> 
> Add a backup API to the Openstack API for Nova Volume.  This is to
> provide EBS style snapshot functionality in the Openstack API.  I'm
> proposing to name it backup instead of snapshot as that seems to
> better describe what is happening.  It also allows room for other
> storage backends to expose real snapshot capabilities down the road.
> 
> In the case of Lunr, we would be making backups of volumes to swift
> (possibly abstracted through glance in the future).
> 
> I have started a blueprint and spec at:
> 
> https://blueprints.launchpad.net/nova/+spec/backups-api
> http://etherpad.openstack.org/volume-backup
> 
> Please feel free to comment and contribute.
> 
> --
> Chuck
> 
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