The data has a save folder on your hard drive.
You can also do backups of your realm.
In addition to that, RW would like you to sync to the cloud.
If you use multiple computers such as prepare on the desktop, but take the laptop to game sessions then the sync is really useful.
If you were to always use RW on the same computer, you're saving to (and reading from) the save on your system.
The cloud is then a backup.
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