Solvespace v2.3 does have an autosave feature but this doesn't do anything when there is no savefile for a sketch. So when solvespace crashes or is accidentially closed while the sketch is still unsaved, the work is lost.

Two possible solutions:

1. Implement some way of persistent data storage for solvespace where every sketch is autosaved until the user specifies a savefile by saving the sketch manually.
2. Using toast notifications as proposed by Eliminate modal dialog boxes #90, remind the user on each autosave interval when the current sketch is still unsaved and therefore not autosaved. This is kind of annoying, but might help to achieve the goal of getting the user to save the sketch.