Transferring information[possible mild spoiler]

[kojack]

hard drives, flash drives, cds, dvds, blurays, floppy disks, etc. All allow physical transfer of the data by unplugging/ejecting them, walking with them and plugging in somewhere else.

(Of course to get it on there in the first place and to use it at the other location at least some of the data must be copied to system ram for processing, so there's going to be at least partial duplication going on)