I work as a digital tech on fashion and advertising shoots all over - there are many ways to skin a cat as they say, and multiple ways you could do this. For simplicity sake, maybe the workflow I use personally can be of some help. Here’s the condensed version of what you could do at home.
Hard drives are cheap and your time and work is valuable. Make yourself a set-it-and-forget-it backup system
Assuming you’re starting from scratch, buy yourself 4 drives, and some backup software (Chronosync)
One will be a clone of your laptop - so get one that’s the same size, or larger (to future proof it) than the internal drive you’ve got inside. Use Chronosync or some other backup software, and set it to mirror/clone your laptop onto it every time it gets plugged in - that way it’s automatic and you don’t have to think about it
Second, buy three external drives. Two identical, and a third from a different manufacturer - make sure they’re all the same size. For example, all 8TB drives, one from HGST, two from WD.
The HGST one would stay on your desk and could be your working drive with all your scans on it
The other two are clones of this working drive above. One stays on-site where it gets synced with Chronosync every week. The other is the same, though it lives off-site - either at a mates house or your office/house depending on where you work from.
Those two drives get rotated every two weeks and this prevents fire/flood/explosion scenarios where you’d lose everything otherwise.
If you have a fast internet connection, you could also look into backing up your scans online via something like Backblaze - anything goes haywire with your stuff at home, they’ll even FedEx you a physical hard drive with your backup on it so you can recover from it that way. Send them the bard drive back when you’re done and they’ll refund you the cost of the drive too
That should sort you out completely.
Just in case you were curious about how digital-techs do this for photographers professionally. We just do the above on a slightly larger scale, backing up as we go along, and multiple copies for redundancy, each given to a different person.
At the end of the day, the photographer will have a drive with his copy of what we’ve shot, I’ll have a copy, the client will have a copy, the producer will get one, art-director etc. Sometimes when shooting abroad, we’ll even get a copy that gets FedExed to the photographers’ studio/home.
At the level of some of these jobs, we absolutely have to know our shit. You hear those stories of wedding photographers getting robbed and losing all the files from the wedding because they only had one copy in one place? Imagine that happening on a shoot with a couple of million riding on the ad-buy, with A-list talent being flown in from all over, a set-build into the tens or hundreds of thousands, crews of 50+, all for one day on set that can’t be rescheduled or re-shot. Now imagine only having one copy of that shoot… it just doesn’t happen.
Imagine the photographer’s laptop gets stolen? No problem, - there’s a backup of his laptop, and the job he shot on a small SSD on his person. He gets robbed and completely stripped of everything? Insurance covers the gear stolen, he can restore his laptop from the cloud or his backup at home, and I still have a copy of the job on me. We’re together and both somehow get robbed of everything? No problem - the client, art-director etc all have copies of the job on them too. Everyone’s on a flight that goes down killing everyone? No problem, We’ve FedExed a copy to the client before getting the plane, and even though we’re all dead, we go out as legends. All good!