Hi! We've been having the same issue frequently with one of our Bedrock Realms. Here's what we know:

• Backups Fail, we end up missing the most recent backup (<30 minutes ago)
• Server Crashes, it isn't immediately after the fail either. It waits a few minutes
• Closing Fails, since nobody can log in, I try to restart, only to have it fail too.

After this, a couple minutes pass by and we're back. Only rolled back to the most recent backup, which is almost an hour ago.

Before we posted this, we went searching for something similar to our issue, only to find REALMS-1330 which seems to be a much worse case than our own, and REALMS-2081 which looks to be more of a corruption issue. As far as we can tell, there's no evidence of such on our world.

Attached are some screen captures showing our missing backups. The crash happens a little after the time when the next backup should've been made.
If anyone wants to look at the Realm specifically, tell me where to send my information and I'll gladly help as best I can. Looking to get this fixed.