My PC, got burned entirely in a fire at my warehouse. Luckily, I had create a backup of my bitcoin core wallet.dat > 2 days before ! < ,so I bought a new pc, with Windows 7 on and now I'm downloading everything from the beginning. In the 6th day, as I had 21 weeks left, my wallet popped up the message: Number of blocks left : Unknown Syncing headers So I believe, that it might take a lot longer, since it might need a -reindex or a -rescan. So I read about the article on migrating Bitcoin core to Electrum. when I searched for the receiving addresses that had money in them, I found only a small fraction of the total amount in blochchain.info.
My Questions are :
A) Will I need a -reindex or a -rescan FOR SURE ? and what's the difference of these 2 ?
B) Why my addresses are almost empty ? OR why can't I find the addresses which have the correct balance inside them ?
Thank you in advance.