For most personal computers, Windows automatically backs up the key online prior to implementing drive encryption. User Manual
For home users, Microsoft attempts to solve user error by automatically backing up Recovery Keys to the user’s Microsoft Account (Azure AD/Entra ID). bitlocker drive encryption recovery key
Without this key, accessing the data on a locked drive is virtually impossible. It is the "master key" to your encrypted data. For most personal computers, Windows automatically backs up
The BitLocker Recovery Key is a single point of failure. For most personal computers