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macOS (formerly Mac OS X and OS X) is a series of Unix-based graphical interface operating systems developed, marketed, and sold by Apple Inc.

7
votes
This is really two questions and aren't really handled well by a single program. The antivirus question is easy, you'll be wanting ClamX. It is an OSX port of the venerable ClamAV engine. It is widel …
answered Aug 6 '11 by Scott Pack
7
votes
FileVault was designed to be enabled at any time so you will have no problems encrypting your data after the fact.
answered Nov 1 '13 by Scott Pack