This is actually a good one. Backup is a huge pain in the butt even today. One good example: Pulling images off of smart phones. What if I want to leave some on my phone? Avoiding re-backing up duplicates by mistake is something I still haven't quite solved.

Most things that I think are missing are really just better implementations of current tech: - Battery capacity - the largest 18650's right now only do 3500mAh - Cooling - I'm really tired of fan noise and super hot laptops. Maybe you can't beat physics here, but maybe some new thermal transfer cooling solutions could be made - Wireless everything is still pretty flakey. Both LTE and Wifi, though 802.11ax looks like it will improve things - Cars: Just way way too complex. I'm not sure what can be done but maintenance on vehicles is just a money pit past 10 years old.

How is this a deal? Using a foreign SIM card, you can usually spend $30 for a MONTH of data. Some sample prices I've paid: (1) Vietnam - $6 for a SIM card for 3gb fast speed then unlimited slow speed for a month (2) Colombia - $13 for a SIM card for 3gb for a month or so (3) Australia - $30 for 9gb (5gb+1gb extra per weekends) for a month Even the most expensive of these only average $1/day, nowhere near $10/day.