Answers
Removes worms, trojans and spyware
Restores data after system failure
Quarantines infected files
Done manually before hardware changes
Keeping OS security patches updated
Copies held in the cloud
Applying the principle of least privilege
Checks email links when clicked
Resetting default BIOS passwords
Kept on magnetic tape
Uses an access control list
Blocks unknown IP addresses
Sits between LAN and internet
Matches known malware signatures
Disabling unused USB ports
Scans removable storage for malware
Monitors incoming and outgoing traffic
Can be hardware or software
Removing unused software and services