Realms back up not working

So I Closed my realm so that I can replace it with a backup of that realm but whenever I do that It always says Replacing world with selected back up failed. If I try using the replace world button instead of the backups the green bar fills up then when it comes to the initializing part it just says Failed Error replacing world. Question is how do you fix this did anyone else experience this if it is a broken bug please fix it so that people won't experience something like this in the future. Thank you