If you don't have a data backup and archiving system, you may find that you'll be rapidly overwhelmed with GB or TB (Terabytes) of audio files depending on how much material you transfer. So keep backup and retrieval in mind if you don't already have these things in place. Ideally you can piggy-back on your IT department for this.
Nothing worse than losing all that hard transfer work. I would not entrust your data to external/portable hard disks, as convenient as they might be.