if you save often you won't lose much.
Heck, I've had the power go out or the system crash and force me to reboot several times, and I thought I had lost an hour or so of programming I had been doing... upon reopening the project, however, I find I lost nothing... and many times I've caught myself unconciously typing Alt+F, down arrow five times, enter to save... and when I say "often" I mean, basically everytime I stop typing.
I also never alt+tab from it without saving first.