I have a new MacBook Air 2020 running Catalina 10.15.6 and I'm asking about the encryption on the internal SSD. When I run
diskutil apfs list it shows that both the "Macintosh HD" and "Macintosh HD - Data" volumes have the following:
FileVault: No (Encrypted at rest)
What does this mean? If these drives are already encrypted at rest, should I, or do I need to, turn on Filevault to protect the data on them in case my MacBook is stolen?