I'm confused about the description in documentation. 
Does that mean if I take a full snapshot (e.g. savepoint) after restoring by explicitly agreeing todiscard the state, then the state won't exist in that snapshot? Or does it just mean ignore thestate but the state still exist forever, unless I explicitly purge that state by using state operator?
And could this behavior differ between different state backend (Memory, FS, RocksDB) ?