Realms World AutoSave

Got on my minecraft realm and did an hour of building just to find all my progress missing when I got back on 20 minutes later. I went to my realm world backups and the most recent backup is 5 hours ago which is long before I did all my building.

What I expected to happen was...: 

I should have had a more recent world back up because it usually auto backs up my world every 20 minutes or so
What actually happened was...:
I did not have a recent world back up.