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I would think that you could leave a Rosetta Stone with directions on how the data is stored and read. It wouldn’t take much, I think. “These glass things contain information, here’s how it is encoded. Here’s the requirements on reading these”. You could start off simple and have a rudimentary one that can be deciphered by hand that describes how to make a device that can quickly pull information from a few others that give directions on how to build another device to read the high capacity ones. You don’t need a specific filesystem or computer to read it, you just need to know how to decipher it and that it IS data stored in a certain way, not just cool looking glass art.
I’ve been using nextcloud apps since setting up a home server, Deck has been pretty useful for me for compartmentalizing my work tasks. There are a lot of different apps you can set up, including a workspace clone, but none of them I would say are worth it unless you want to use nextcloud in the first place. There are ways to sync nextcloud with Google drive, but I haven’t tried it yet. If you have a raspberry pi you can install nextcloud using the nextcloud pi install script pretty easily. I ran it on a pi 4 without any issues for a few weeks before migrating it to an old nuc.