I would say most of us see a bad idea in the making when we see it.
Don't get me wrong: Locking down your Porn is a good idea but lets get a few things before we come up with the how of it:
1) Encrypt the data with gpg ( or the like ).
Upside:
Downside:
- Any encryption worth doing is very CPU intensive. You are probably looking at a day to encrypt a full DVD's worth of data.
- And depending on chunk size, if you have any corrupted sectors, you could lose quite a bit
- System restore would take a very long time and be a convoluted process
2) Password protect compression file
Upside:
- On top of the benefits that encryption will give you, this will give you a smaller file to work with
Downside:
- All the bad things about encryption appy here
- Not only are we unecrypting the data now, we are uncompressing it. All 5gigs
- Depending on the encryption, 1 failed chunk could cost you the entire archive
In short, there is no real safe way to lock down that much data using software mechanisms, and the things you can do would make restoring the system a pain in the ass.
Now, what I'd recommend is this:
1) Burn 2 dvds ( same data, twice ), store these two dvds in seperate locations.
2) Store 1 dvd on site in a fireproof safe
3) Send the second dvd to your parents, and have them store it in a fireproof safe
The real question is why do you need this much security? If it's that big of a concern, then a few hundred bucks on a couple firesafes is a justifable cost ( and likely a business expense ).