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The block can be overridden, but think carefully before you do so.

They are: -CleanMyMac 2 -MacKeeper 2012 I want to know which is better.

Thanks.

Make redundant backups, keeping at least one off site at all times.

Dont back up your backups; make them independent of each other.

Dont rely completely on any single backup method, such as Time Machine.

If you get an indication that a backup has failed, dont ignore it.

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Keep your software up to date.

In the Software Update preference pane, you can configure automatic notifications of updates to OS X and other Mac App Store products.

Some third-party applications from other sources have a similar feature, if you dont mind letting them phone home.

This is especially important for complex software that modifies the operating system, such as device drivers.

Before installing any Apple update, you must check that all such modifications that you use are compatible.

Dont install crapware, such as themes, haxies, add-ons, toolbars, enhancers, optimizers, accelerators, extenders, cleaners, doctors, tune-ups, defragmenters, firewalls, barriers, guardians, defenders, protectors, most plugins, commercial virus scanners, disk tools, or utilities.

The more actively promoted the product, the more likely it is to be garbage.

As a rule, the only software you should install is that which directly enables you to do the things you use a computer for such as creating, communicating, and playing and does not modify the way other software works.

Never install any third-party software unless you know how to uninstall it.

Otherwise you may create problems that are very hard to solve.

The free anti-malware application ClamXav is not crap, and although its not routinely needed, it may be useful in some environments, such as a mixed Mac-Windows enterprise network.

Beware of trojans.

A trojan is malicious software (malware) that the user is duped into installing voluntarily.

Such attacks were rare on the Mac platform until sometime in 2011, but are now increasingly common, and increasingly dangerous.

There is some built-in protection against downloading malware, but you cant rely on it the attackers are always at least one day ahead of the defense.

What you can rely on is common-sense awareness not paranoia, which only makes you more vulnerable.

Never install software from an untrustworthy or unknown source.

Any website that prompts you to install a codec or plugin that comes from the same site, or an unknown site, is untrustworthy.

Software with a corporate brand, such as Adobe Flash Player, must be acquired directly from the developer.

No intermediary is acceptable, and dont trust links unless you know how to parse them.

Any file that is automatically downloaded from a web page without your having requested it should go straight into the Trash.

A website that claims you have a virus, or that anything else is wrong with your computer, is rogue.

In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default.

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