Photographing
what fades.

Archiving
what matters.
I photograph places, people, and things that are easy to overlook. 
MY PRACTICE -
The camera comes last.
I spend a lot of time in places before I photograph them. Talking, reading, coming back, sitting with people until the camera stops being a thing in the room. Sometimes this takes days. Sometimes years.
I am not sure I think of what I do as documentary photography exactly. It is more like sustained attention to things I find worth paying attention to.