I just created a new Annex by doing the following:

  1. git init
  2. git annex init
  3. git annex add .
  4. git commit -m "Added files"
  5. git annex status

I see the following:

local annex keys: 224
local annex size: 41 gigabytes
known annex keys: 235
known annex size: 49 gigabytes
bloom filter size: 16 mebibytes (0% full)
backend usage: 
        SHA256: 459

Why is there an 8 gigabyte difference here? What/where are those files? What is a bloom filter?