I did a quick Google and came up with this.B_Nut wrote:But, WHAT IS THE SNAPSHOT DELTA TIME?
(Source)Wikipedia wrote:Snapshot technology—known formally as "delta snapshot technology"—gives the ability to use the same dataset multiple times for multiple reasons, while storing only the changes between each dataset. Some storage vendors integrate their snapshot capabilities at the operating system and/or application level, enabling access to the data the snapshot's are holding at the system and/or application management layers. Terminology around snapshots and "clones" is currently confusing, and care must be taken when evaluating vendor claims. In particular, some vendors call full point-in-time copies "snapshots" or "clones", while others use the same terms to refer to shared-block "delta" snapshots or clones. And some implementations can only do read-only snapshots, while others are able to provide writable ones as well.
Also, Hylis talked about it in part 4 of this post.