Backup with time machine

I backup my Aperture Library with Time machine. When I work on a picture, does TM back up just this picture or the whole Library??


I came on this thread via Google, and it's less than 2 months old, so hopefully I can resurrect it justifiably.
I noticed that the warning about Aperture running with Time Machine in the above link no longer exists , but does show in OSX 10.6 Time machine advice.
Can we now assume its no longer a problem in Lion??
OSX 10.7
OSX 10.6