If you are asking about possible locations, where you could save your bitlocker recovery key here are the available options:
- In your Microsoft account: Open a web browser on another device. Go to https://account.microsoft.com/devices/recoverykey to find your recovery key.
- On a printout: You may have printed your recovery key when BitLocker was activated.
- On a USB flash drive: Plug the USB flash drive into your locked PC and follow the instructions. If you saved the key as a text file on the flash drive, use a different computer to read the text file.
- In a work or school account: If your device was ever signed into an organization using a work or school email account, your recovery key may be stored in that organization's Azure AD account. You may be able to access it directly or you may need to contact the IT support for that organization to access your recovery key.
- Held by your system administrator: If your device is connected to a domain (usually a work or school device), ask a system administrator for your recovery key.
And here is a recovery guide: https://learn.microsoft.com/en-us/windows/security/operating-system-security/data-protection/bitlocker/bitlocker-recovery-guide-plan
Regards