I'm reading some documentation and whitepaper about Transparent Data Encryption. Some documentation mention to backup the Service Master Key as well (For clarification I'm not talking about the Database Master Key). I just don't exactly understand why this is necessary, because I was able to backup/restore a Database with TDE Encryption from Server A (backup) to Server B (restore) without using any Service Master Key.
In what scenario do I need to restore the Service Master Key?