Yikes, a good remind to keep backups (hard copy and digital!)

I also strongly recommend using a password manager. It is more secure than a text file on the computer, and you can store the encrypted backup of all your passwords on a USB key or even in a cloud service. If someone hacked that, they still would have to break the encryption of the backup which assuming you have strong master password is less of an issue. And also requires you to memorize one strong master password too.

Though given all the recent breaches, and widespread malware that can be silently installed on our personal computers, having an obfuscated paper backup is probably the best bet for reliability and statistical possibility of being compromised -- assuming it is not a sticky note taped under the keyboard ;-)