My plan is to construct a 2 of 4 backup.

• One paper in my house
• Second one as a digital file, encrypted with TrueCrypt and uploaded to Google Drive (protected by 2FA)
• Third paper with my parents
• Fourth paper attached to my last will

With this scheme I am always able to reconstruct my own wallets without external help, although it's still very hard for anyone to get their hands on more than one backup. I am protected from a fire destroying my house and my family can access my funds in case I die.