Update, if a different copy of the sane world is used to replace a realm, the inventory, location, level and current ender chest data in the replacement world is permenant in all backups and downloads.
As an example i start a realm at time point A. I download a copy of the realm at time point B. I play single player until time point C and replace the realm with time point C. Then i play to point D and download the world again.
In this example world D is downloaded, but the owner of the realm is stuck in point C for every backup between C and D. All other players are fine at point D.
Random Murican
Update, if a different copy of the sane world is used to replace a realm, the inventory, location, level and current ender chest data in the replacement world is permenant in all backups and downloads.
As an example i start a realm at time point A. I download a copy of the realm at time point B. I play single player until time point C and replace the realm with time point C. Then i play to point D and download the world again.
In this example world D is downloaded, but the owner of the realm is stuck in point C for every backup between C and D. All other players are fine at point D.