The realm didn't save the last time i exited

My friend and I went mining and  we got 12 stacks of iron for our beacon, (6 stacks each) we also found 17 diamonds or so. so we got all our iron and built our beacon. Once we built our beacon there were 3 raids so we got about 3 stacks of emeralds from that. So I got off after the raids. I did save & quit then closed minecraft. I come back on the next day and ALL of our stuff is gone. 12 stacks of iron, 2-3 stacks of emeralds 17 diamonds, all gone because something happened. Is there a way you can give us our stuff back or maybe look in the old files and see what we had? My username is ConvictedDad on xbox one.

thanks