Basically I am trying to figure out how to keep my backup secure, I am going to be archiving the home directory of my system which has some important documents such as tax returns, a password database, etc...
So the best way to keep that secure would be to use a key file that would enable it to be encrypted before backing up without the weakness of a "short/semi long" password, it could even be combined with a password for extra security.
However my biggest worry is.... You can't backup the key file with the backup because then you are basically storing the key with the lock which makes no sense. I mean sure you could encrypt the key file with a password but then the password becomes the weakest line of defense.
So at this point in time I am wondering what is the best way to keep the key file secure and backed up somehow so a loss of the computer or the house burning down won't compromise my ability to go back and retrieve my encrypted backups.