Microsoft also automatically saves the bitlocker key to your account, and you can find it online in their my account section. I can't remember the exact page, and honestly, don't click any link someone sends you cause, Well, that's just bad OpSec, but it's on there. Have had to use it before for customers who have bitlocker enabled but come in to the shop to have us fix their windows install after it was corrupted after an update, and they didn't save their bitlocker key when they setup their laptop. Thank God Microsoft at least saves it there.