I've got a question,

I've updated my iphone software,
and as you all know after jailbreaking it i will need to restore and stuff,
which means its a new phone now,

but lets say i want the photos in my iphone album still be in it,
and i've backed up the photos in my external harddisk,

SO here's my Question,
is it possible if my photo albums that i backed up in my external Harddisk and sync the photo albums back to my iphone again?

and if yes,
whenever i sync my iphone to my itunes without my external hard disk being inside,
will my backed-up photo albums inside my HDD that is already be put inside my iphone be erased?

is there anyway that i could still remain the backed up pictures be in my iphone without me having to constantly plugging in my HDD to my laptop just to sync it?

Please help =(