Hadoop, an Apache Foundation project, is free, open source, and aimed at managing millions of massive files for batch processing and streaming. While Hadoop might be a lot of work to set up, and there are good alternatives to everything Hadoop does, Hadoop is a ready made package of useful things working together, creating an easier to maintain system compared to a build your own system.
Another laptop comparison with a recommendation that does not match their test results. Why are so many comparisons wrong?
Do you use GTK? Have you tested borders around boxes? Here is a ready made test of GTK 3.22 box borders.
Computers and handheld devices slow down every day. You can rejuvenate your smartphone/desktop just as fast and give them the occasional upgrade to keep or exceed that new speed feeling.
Openbiblio is free open source software and can run on very low cost Web hosts. This could be the lowest cost first option for your library when you have the right software skills on your team.
Programming in C is difficult and the reward is fast execution of the code. For someone learning C, there is also the reward of excellent brain cell exercise.
Timeshift is promoted as a way to recover files for a broken system or user directory. I use Timeshift to backup everything so I can restore anything.