Yeah that's a possibility but that massively depends on the level of surveillance the journalist is under but lets assume moderate. With that in mind, the only method I can think of would be physically hiding the drive/s in the other house (more paperwork needed for the alphabet people) in a place that would still be accessible, with permission of the owner of course. Don't know how thorough raids are at looking for stuff but I can think of a couple places that may be sufficient if its poor to moderate job. Be screwed if they're combing the entire place though so the journalist would have to rely on encryption