I hate to dis-assemble the photo album. Is this a must to preserve the photos?

Good question. And what a treasure! Most of us would love to say we had such an album in our possession, and it is completely understandable that you would want to preserve it as it is.

The good news is that you can! Unless the photo album is one of the magnetic albums, which isn't the case in your example, it is actually best to leave the old album intact. Old family photo albums have their own personal story and order which would be lost if the photos are removed. If you have any photos which have come loose, replace the photo corners. To further protect the photos and album from deterioration caused by dyes or acid in the black paper, interleave the pages of the album with acid-free paper and store the photo album in an acid-free box, preferably plastic (pvc-free). To avoid deterioration, keep the album in a dark location with a moderate temperature - under your bed or on a shelf in the back of the closet, etc. Not in the attic or basement, and not out on display where the light can harm it. Think comfortable - if it's a place where you would be comfortable day in and day out, then your photos will be too.

If you have the time and tools, you may also want to consider scanning the photos into digital format. This way you have an alternative copy in case the originals don't survive. It also makes it easy to print copies for family members, and cuts down on handling of the album itself.