Scrapbooks can be merged from two files. It is most convenient to keep scrapbooks to about 10 -15 pages so that less reprinting is required when a color printer runs out of ink or a new set of scans is added. Individual scrapbooks can be searched. Family groups, pets and homes are usually in marriage scrapbooks. Scrapbooks can also be used for local history that applies to more than one household.
Genealogy programs require smaller image files than archival quality scans.
Slide scanner makes 16 MB files of full size 35mm slides scanned at 2400 dpi. My choice of image format is high quality JPEG at the time of original scan not default or maximum compression. Use some of your scans for the intended final purpose as they are collected. It is possible to have a computer screen set incorrectly and in that case all the pictures will print too light or too dark. A color pattern test image is helpful for checking scanner to screen to printer combinations.