Save Block without Location

Hello,
I have a class AbstractBlock. This class has to save all data of block without Location, World, Chunk and other global variables, but I don't know which data I should save.

I thought about block's metadata, but Metadata resets on server restart. I must save data required for reproduce all type of block, for example chest with its inventory, but not only for all blocks. I not want to make very big if else tree, cause it's not efficient.

Which data I need to use?

Info: I make plugin for 1.14.2 minecraft version.