When looking at the progress of an init sync for a backup, you get something like:

bunt_replica_set	Started		12/29/14 - 19:26	12/30/14 - 20:50	transferring - bunt.cards(8/152) - 33%	11/26/14 - 22:23(complete)	

Let's add a description of what those numbers mean in the doc. I think they are:

• 8/152 => means 8th collection out of 152
• 33% => % transferred for the current collection. However I am not sure if those are % of documents, or % of datasize.