I think you might want to ask yourself several questions to formulate the best solution for you:
1. Do you need a single storage device or could you split your data into logical buckets across several devices?
2. Do you really need/want all 69T? And, if so, are you going to be continuing to grow your data in the future?
3. How much space will you have to store/rack your device(s)?
4. Will you be able to keep your hardware in the recommended climate (temp/humidity) on the road?
5. How/will you backup your data?
6. What's your overall budget? You can find external 6TB drives for $150 or less (around 2+ lbs. each) or you can spend thousands on lots of equipment!
I keep things in lower resolution, backup all I can on free/cheap cloud services (with redundancies) and use inexpensive, bus-powered drives that take up very little space! I have a lot of data, but not as much as you!
Good luck; let us know how you tackle this!