This is the second installment in a series presenting configuration management work that comes out of the Drutopia initiative.

In part 1 of this series, Configuration Providers, we introduced the problem of managing shared configuration, starting with how to determine what configuration is available.

But knowing what configuration is available is only part of the picture. To import configuration updates, we also need to answer the question: what's changed since the configuration was originally installed? That's where snapshotting comes in.