The snapshots do not backup or restore the composer DB, meaning that while the blueprints are on the system, they're (except for one blueprint in some situations) not visible after a restore.
Additionally, this removes user favourites and any other settings we might store.
I have been able to restore and see the blueprints inside the composer. Also to edit them. So to me it's working
Doesn't work from v4.1 to v4.2
The bug relevant to versions prior 4.2 (snapshot has taken <4.2).
Should be documented.
Also worth noting that it /can/ work in some circumstances for a single blueprint from version prior to 4.2. I'm not sure of the exact circumstances of that though.
In any case, https://github.com/cloudify-cosmo/docs.getcloudify.org/pull/505
That's the documentation update, should be live shortly here: http://stage-docs.getcloudify.org/cfy-7480-fix-snapshots-docs/manager/upgrade/
This applies to only unsupported versions now.