I like to record everything (being in a country where one party consent recording is legal) on what I talk on the phone. I also keep in my pocket a small mp3 player to record what I talk with others. Every week, I cut the new recordings (I preserve only the conversation, not the background noise), rename the audio files by date, put in directories named based people who I talked, comment them and store them in a archive on my encrypted hard drives. I wrote a software which makes my work easier. I do this since 2006 and now I have over 100 GB of audio recordings which represents over 8000 hours of audio. It is very cool to listen back old recordings and relive that moments.