The number one priority was for him to spread the information as fast as possible to as many people as possible. Given the limited bandwidth, limited electricity, limited availability for physical storage devices, and limited everything, do you really think that backing up his data was his priority? Have some empathy...
Are you calling a man that was living under a g*nocide documenting the horrific war crimes an idiot because he didn't back up his data, do you hear yourself??
The amount of pro-colonial sentiment in the thread here is baffling. The people that were colonized and stolen from have the right to do whatever they want with these artifacts, even if you believe they may not have the means, or will sell them to private collectors.