Backing up collection photos

hello everyone, having trouble backing photos way want in lightroom 4.

 

currently, import images lightroom and, once i've finished editing, mark images want keep "pick" flag.  since not have space photos, selectively (online) these picked ones.

 

the straightforward way this, suppose, create smart folder in hard drive "publish" section of library searches picked photos. then, able click publish periodically put picked photos in specific place on hard drive, ready up.

 

however, seem put picked photos in same folder. that's annoying me, because keep picked photos in different collections.  (i put picked photos in new collection every time i've finished editing photos event, birthday party, family gathering etc.)

 

so i'd retain collection information. in other words, i'd publish picked photos in "parent" folder somewhere on hard drive, within "child" folders describe collections in.

 

is possible?

 

all information can find on lightroom backing suggests "all or nothing" – isn't photographers me, can afford portion of files.

select picked folders using library filter or smart collection , select all. file>export catalog… destination want them up.  keep of folder structure, collections , metadata in addition image files.

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