Depends what you mean by “crash suddenly”.
If is just a minor “not starting” doesn’t mean is crashed. You need to diagnose what is going one.
Jumping straight into “recovery” is not the first you should do. Is the last thing you should do.
That file can be accessed anytime, taking your drive and access it from another PC.
Yes.
Yes, standard procedure.
There are others ways, more advanced and require you to have knowledge about this stuff.
Read my guide and pay attention not just read the surface.
http://community.umbrel.com/t/how-to-restore-your-node-wallet/