Right now ... I use a 1TB WD passport attached via USB as sort of an offload. i have a macbook pro, with a 500GB internal SSD. So, when I get done shooting, I: Copy the NEF files to the passport with Finder (SD -> passport/lightroom/offload/RawFromCamera). Import the NEF files to the local HD. Yes. This creates another copy of the NEF, this is by design. Everything is filed by the date the image was shot, so all the folders are named with a date e.g. 2015/2015-10/2015-10-23 Manupulate, photoshop, yadda yadda yadda. After about 2 months, I move -- with the lightroom UI -- the entire folders back to the passport (passport/lightroom/working/2015/2015-10/2015-10-23) to make room for new images. Now ... the passport is starting to fill up. And there's no offsite storage. And there's a single point of failure. So it's about time I started thinking of what to do. Another thought is to use the 1TB of space I have with microsoft's OneDrive that comes with my office 360 subscription. One thought is, after a year, to carve everything off that's over a year old, save it to a 500GB external drive and put in a safety deposit box.