A working nuclear thermal propulsion (NTP) engine was already built in the 60s under NASA’s NERVA project. It is one of the highest technological readiness level solutions we have to the dilemma of high specific impulse versus high thrust present in the current spsce engine technologies. Imo we need something like this to make manned interplanetary missions viable.
Something like Amazon Glacier is your best bet if you don’t access data often and are okay with paying a (per-GB) monthly fee. Otherwise, you may want to build a NAS PC with high levels of disk redundancy (RAID5 or RAIDZ2)