1. A method, comprising: accessing stored virtual machine snapshots, the virtual machine snapshots having been captured from one or more executing virtual machines; and automatically forming a pool of features comprised of features obtained from the accessed virtual machine snapshots; and performing automated analysis on the pool of features to identify one or more traits of one or more of the virtual machine snapshots, wherein the automated analysis either: computes probabilities that correspond to the one or more virtual machines, respectively; categorizes one or more of the virtual machines into one or more pre-defined categories; or ranks the one or more virtual machines relative to each other with respect to relevance to a predefined trait, wherein a rank of a virtual machine indicates its relative relevance to the predefined trait.