- Administrator Account - manage the user accounts and ensure that there is only one administrator account - which will get used only to administer the machine and never for general PC usage. Everyone, including myself, will log in by default with "user/standard" privileges.
- Turn on OS X Software Firewall - protects computer from unauthorized access by monitoring all incoming network traffic.
- Turn on OS X File Vault - automatically encrypts and decrypts the contents of your home directory on the fly.
- Permanently deleted files - make more frequent use of the Secure Empty Trash OS X feature to ensure that deleted files cannot be restored.
The other action I should take is to enable an anti-virus checker such as ClamXav or Norton Anti-Virus. Not sure that I am ready to do this on my Macs yet. But probably should if I really want to ensure that my systems are as secure as they can be.
The longly Windows PC that remains at my house will also get a similar treatment plus a spyware detector such as Windows Defender.
By taking these simple actions, the consequences of a lost or stolen PC will be reduced to a simple financial loss instead of a more complicated and serious risk of identity theft.