Restoring an entire Multisite from Snapshots - how to?

Forgive me if this has been asked elsewhere, but I can't find the info after searching for some time.

I have a multisite install with around 10 sub-sites. My individual snapshot backups of the primary site and each sub-site all appear to be backing up to Dropbox nicely and I'm very pleased with the plugin so far, however I have two questions:

1. In the event that I need to completely rebuild my multisite installation, what is the procedure for doing this using my snapshot backups? I can't seem to find a 'how to' anywhere?

2. Is there any way of backing up the Wordpress multisite core files, so in the event of me needing to completely rebuild my multisite install I have a copy of everything I need?

Finally, I have used Snapshot to move a single WP install from one server to another and it worked really well, so I'd like to say thanks to the developers for creating such a worthwhile plugin!