+1, I got it now. AES is actually secure enough, that it'll be safe forever provided mathematics don't completely vanish and the laws of physics still apply (and your key-length is sufficient).

Still, I prefer not to encrypt the file, since the passphrases either have to be written down or remembered, both of which aren't exactly ideal (Think brain hemorrhage, which I definitely plan to get one of these days).

Also, newbs can barely handle Ubuntu.