I was playing My 300 day Minecraft world and was saving and quitting the game but then the power went out. I turned my computer back on and my world was gone and I could not find it.

I was playing my 300 day Minecraft world and I finished part of my giant castle that I had started on day 1. I completed a lot of it so I decided to get off for the night. As I was saving and quitting the power went out. I didn't think it was that big of a deal because I had probably just lost todays progress. So I turned on Minecraft but my world was gone. The world had just disappeared and now I lost my best Minecraft world