Might be a silly question but...

As the folks Demotivators said, "There are no stupid questions, but there are a lot of inquisitive idiots." So here goes.
Why should I be using Filevault. I had it turned on for awhile after I bought the Mini, but after noticing the huge amount of harddrive space it used up, I turned it off. Now however, with my FTP running, is it something I should consider turning back on?
I've read up on Apple's site on what it does, how it would take 149 trillion years and whatnot to crack it it, encrypts and decrypts on the fly, etc. But what's all that mean for me. Can anyone put it into laymens terms on what exactly it's function is and who it prevents from doing what? If I have it turned on and I've got the login screen on, will it take them 149 million years to break go around it or something?
Thanks,
Stephen
Mac Mini   Mac OS X (10.4.5)  

Stephen,
An Unencrypted Look at FileVault, by François Joseph de Kermadec is an excellent discussion of the features, pitfalls, and cautions regarding Filevault.
Although the article discusses Panther and is dated 12/19/2003, the concepts as they apply Tiger have not changed.
The cautions and warnings are prominent in any of the Apple Knowledge Base articles referring to the use of FileVault. If a user is unfamiliar with any aspect of FileVault, it should not in my opinion be activated.
As good as FileVault is in protecting your sensitive data, it also presents the danger of locking up your files in an irretrievable ball of one's and zero's. Backups are critical. You must ensure that you have a comprehensive backup plan. Backup and Recovery, by Dr. Smoke is a fine example of what you need to consider.
;~)

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