I can not tell you from personal experience, but here are a couple of links.
http://antiques.about.com/od/QuiltsLinensTextiles/a/How-To-Preserve-Antique-Quilts.htm
http://www.quiltstudy.org/about/care.html
I’d look at a bunch of the sites to see what the general consensus is, who seems to know the most, which is likely to be the most reliable, etc, well, because that’s just what I like to do, lol.