You may be right, there is perhaps no reason to go with a database (was considering regular binary files anyway).
I’m not gonna be using compression but I might combine a lot of voxel-chunks together and write them to a file and then put the index into the filename so that the server knows what file to use instead of a database.
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I suppose that it’s performance is the same as any other disk I/O operations, which should be okay. Perhaps also add folder structures because if too many files are created within the same directory, it will slow down performance and creating 1 huge file can not possibly be efficient either.