https://github.com/ente-io/ente

Fully open source, End to End Encrypted alternative to Google Photos and Apple Photos

So OP’s headline should be saying instead: Reminder to CHECK your ~/.cache folder every now and then

Void seems cool.

But battery might be important since a lot of laptops will not start if the batttery is missing or has undervoltage. General advise would therefore be to not discharge the battery to a bare mininum but to keep it always at least 20-30% charged. Especially when Laptop is not used for longer time.