how do I back up the whole network

I am using the snapshot plugin from the network Admin, but its not very clear whether its actually backup the whole network or if its just backing up the primary site...

I'd like to clone the network for development purposes- and also quite like to be able to backup the whole thing anyway since its early days and I might change hosting providers (any you recommend btw?). Any tips on how I go about doing that?

Thanks in advance :wink: