Backing up the Bitlocker encryption key to OneDrive* has been the default since bitlocker was introduced in Windows Vista in 2007. The dialog has for this has

Backing up the Bitlocker encryption key to OneDrive* has been the default since bitlocker was introduced in Windows Vista in 2007. The dialog has for this has always offered the option to back it up to a USB drive and the dialogs function is largely unchanged the past 18 years providing access to backup up the decryption key to a local target or online. *Back then OneDrive was called Windows Live Folders