Before seeds you did have to backup your .dat file with all your private/public key pairs.
Discussion
Then Im even more confused! I rather have the file I think! 🤔
How would they spend their BTC though? They would need to import it into a wallet? Kinda glad I came later, much less confusing now. 🤙
Yeah you have to load the file into your bitcoin core and rescan the blockchain for funds. The file was literally a list of all your private keys. More info here: https://en.bitcoin.it/wiki/Wallet