Lets say you create virtual machine protection and current conditions allow “Backup Using Child Partition Snapshot\<VM>” or in short; ‘online’ protection. Then you change the VM configuration and introduce one of the conditions that prohibit online protection (see below and http://technet.microsoft.com/en-us/library/ff399205.aspx). At this point online protection (as the data source name suggests) will no longer happen. Instead ‘Backup Using Saved State\<VM>’ or ‘offline’ protection will occur but is not reflected in the data source name. Let’s repeat this; if a VM configuration condition changes after protection was created, the data source name which is indicative for the type of protection may no longer reflect the actual type of protection! Online protection could become offline and vice-versa.
DPM does not depend on data source names (but your scripts could) and does not change these once protection is created. Therefore it is recommendable to fully configure a VM with the intended most usual set of conditions before creating protection for it.
Let’s top-off repeating some details;
Online protection is not possible when;
Nice heads up. Spent a few days figuring that out myself recently.
Surely this behaviour (specifically DPM not updating data source names after they are created) is an issue to be addressed, and not by design?