My great aunt on my father's side recently passed away. It is always a sad time when a family member leaves this life.
Other relatives started to share pictures and stories of this women I have never really met- as I clicked through the pictures and read the captions associated with each picture, it became very clear to me that pictures are invaluable when it comes to family history.
The strategy today is to visit your family that is still living and got through pictures making small captions for each as you go. If you do not do this, the pictures become nameless faces with us endlessly wondering, "Who are these people?"