Jack_of_shadows
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OrnsteinDragonslayer, welcome to the community of users of the HMM5 map editor. Now you have experienced firsthand how important it is to back up your map daily. Crashes while editing scripts are common, so I recommend using something external (HoMM5 MapScriptsEditor or just Notepad to open MapScript.lua). If something happens, when you open the map, it will be unzipped into Editor/H5MMods, from where you can try to recover something in the worst case. You can also check there what weighs how much – this relates to the size issue.