Add backup to cinder architecture page
Add backup to cinder architecture page

Change-Id: Iedf0f5d36fbda8af95bc6e864bdaedef80a62df4

eharney/cinder,mahak/cinder,Datera/cinder,Datera/cinder,eharney/cinder,openstack/cinder,openstack/cinder,phenoxim/cinder,j-griffith/cinder,j-griffith/cinder,mahak/cinder,phenoxim/cinder