Notekeeper does not download the content of all the notes in your Evernote account, so that it doesn't fill up your phone's memory. Only recently accessed note contents / images are stored in the phone. However, you can select certain notes / notebooks for offline access, and those notes are always stored in your phone. This behaviour is similar to that of most of the official Evernote mobile applications (like Evernote for iPhone and Evernote for Android).
For more detailed information on how Notekeeper manages data, please see this blog post.
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