Autosaving

Autosaving is often a godsend for me, since Blender has started crashing more often for me. However, my file has reached 500MB and I will run out of disk space real fast. Is it possible to limit how many autosave files should be kept or automatically erase older ones?

The free PowerSave add-on lets you set a specific number of autosave files, it automatically overwrites old autosave:

Blender started crashing more whenever I add in particles. Each time it does, Powersave is gone. Is there another alternative, or is the crashing unrelated?

Oh, nope, not related. It crashed even after I disabled it.