Yes, Pocket saves a snapshot of the original, as well as a slimmed down version that's ideal for reading (akin to a "readability" version - maybe exactly that).

Yes, Pocket saves a snapshot of the original, as well as a slimmed down version that's ideal for reading (akin to a "readability" version - maybe exactly that). The mobile app also syncs the slimmed down versions so you can read them while offline. If you're using it for that, be sure to open the pocket app once in a while as it will stop syncing if you haven't opened the app for some [undetermined] amount of time.