Could someone please explain how iPhoto stores files?

Hi everyone,
I am trying to upload my iPhoto library, which has grown much too ponderous for my laptop's small drive, onto Flickr for storage so I can downsize the iPhoto library to a more useful size.
My iPhoto library tells me that I have 16, 417 photos. When I get info in the Finder for my photos folder, I find that it consumes 79 gb. There is nothing in that folder except the iPhoto library, and get info for that library indicates that it is consuming 137 gb. I am now uploading photos to Flickr using PicBackMan and there are now over 22,600 photos in my Flickr collection, and counting. I don't know when it's going to stop! Of these, PicBackMan's deduper has only discovered and removed 74 duplicate photos. I really don't want to deal with even more photos on Flickr than I have already on iPhoto, but apparently iPhoto is hiding a lot of photos from me that PicBackMan is transferring. photo sizes vary, but typically they run in the 1 mb range.
So I am curious, and might benefit from more understanding about how iPhoto operates. Perhaps someone could explain a few curiosities:
1) how can a folder have a size that's smaller (much smaller, 79 gb) than the item within it (137 gb)?
2) why is the iPhoto library so large, 137 gb, when 16,417 photos should only require about 16 gb? Even with 2 versions of each photo (original and edited) plus a thumbnail, it seems it should only need about 40 gb, so what's iPhoto doing with all that additional space?
3) how many versions of each photo does iPhoto store?
4) can multiple versions of photos be recognized as duplicates by PicBackMan? (sorry, I realize this is only an iPhoto forum, but just in case you know, I'd like to find out)
5) does anyone know when my upload is ever going to stop? And if it ever does, how can I efficiently get it down to a more manageable size?
Many thanks.

Key question: Does PicBackMan  understand iPhoto? I can see no sign on their website that it does, and you should let nothing upload directly from the Finder, but only via hooks into iPhoto.
1) how can a folder have a size that's smaller (much smaller, 79 gb) than the item within it (137 gb)?
good question, but one for the Finder folks as that's the source of that issue.
2) why is the iPhoto library so large, 137 gb, when 16,417 photos should only require about 16 gb? Even with 2 versions of each photo (original and edited) plus a thumbnail, it seems it should only need about 40 gb, so what's iPhoto doing with all that additional space?
The Library contains the Master, the Preview, different thumbnails (the main window, faces etc) and a variety of metadata and database files. There are also caches - some, like the one for interacting with iOS devices (the iPod Photo Cache) can get huge, in excess of 20 gigs). But that said, it does seem rather large. Have a look inside, sort on size see where the size is.
3) how many versions of each photo does iPhoto store?
Full size? Master and Preview, then the thumbs
4) can multiple versions of photos be recognized as duplicates by PicBackMan? (sorry, I realize this is only an iPhoto forum, but just in case you know, I'd like to find out)
Looking at their web page, I doubt it.
5) does anyone know when my upload is ever going to stop? And if it ever does, how can I efficiently get it down to a more manageable size?
One for the PicBack people

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