cache == a flash drive or group of flash drives (although it could also be a USB HD, etc.)
Not through the internet. Through moving from flash drive to flash drive. If you follow the "testing" section along with the network maps for both the "basic configuration guide" and the "large configuration guide", that should clear up a lot of the magic.
You might want to say like storage device instead of cache, that would have made it less confusing for me to understand from reading the wiki.
It also seems like the system is just begging for caches to go missing (though I understand that as all the files are encrypted, it should be hard in theory to actually get data if you arent authorized access to sneakernet).
Are you hashing the files all the time to make sure that files aren't getting corrupted in transit or when taken from someones external cache?
Not through the internet. Through moving from flash drive to flash drive. If you follow the "testing" section along with the network maps for both the "basic configuration guide" and the "large configuration guide", that should clear up a lot of the magic.