An administrator is attempting an OS upgrade on a VM disk that is stored on a SAN. In the event of a failure, the administrator wants to ensure the system can return to a working state in the shortest amount of time possible.
Which of the following backup methods would BEST accomplish this?
A . A storage-level snapshot made on the SAN
B . A full file-system backup stored on the SAN
C . A full file-system backup stored on an LTO tape
D . A system recovery point made with the OS
E . A bit-level image stored on an SSD in the VM host
Answer: B