Paper initially backing up main files (4)
I believe the answer is:
bumf
'paper' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'initially backing up main files' is the wordplay.
'initially' says to take the initial letters.
The first letters of 'backing up main files' is 'BUMF'.
Can you help me to learn more?
(Other definitions for bumf that I've seen before include "Too much information!" , "pile of leaves" , "Printed material" , "Junk-mail" , "Boring documents etc" .)