In most situations, your BitLocker recovery key is automatically backed up when BitLocker is first activated:

• https://support.microsoft.com/en-us/windows/back-up-your-bitlocker-recovery-key-e63607b4-77fb-4ad3-8022-d6dc428fbd0d

Unless your base argument is "Microsoft users are all stupid", then I remind you that this is not only default behavior, but is mandatory if your account is associated with an EmtraID account (i.e. any business or school)