NerdStorage is used to store and retrieve simple sets of data, including users' configuration settings and preferences (like favorites), or any other small data sets. This storage is unique per Nerdpack, and can't be shared with any other Nerdpack.
This type of storage can be broken down into three conceptual categories:
User storage: Data is attached to a particular user. If you’re authenticated as the user the data is attached to, you’ll be able to read and write.
Account storage: Data is attached to a particular account, meaning that all sub-accounts and users in those accounts can read and write the data. If you’re authenticated and can access the account, you’ll be able to read and write.
Entity storage: Data is attached to a particular entity. If you’re able to see the corresponding entity (meaning that they belong to an account containing the entity), you’ll be able to read and write.