I have the free Evernote account; I am running Mavericks on my iMac and iOS 7 on my iPad and iPhone. I haven't been able to find a clear explanation of where my data is stored and where it is not stored. I understand that all my notes are permanently stored (unless I delete them) on the Evernote servers and that I can access them through my browser if I want to. But: (1) Using the Evernote desktop app on my iMac, I seem to be able to access my notes very quickly, which suggests that copies of all my notes are also stored on my hard drive, updated when I sync, and where I can access them