I have a special notebook/photo album for important documents and pictures. This is primarily for direct line ancestors. My title for the book may be a bit irreverent, but I call it my "begat, bewed and begone book."
Begat: birth certificates
Bewed: marriage licenses, applications, returns and certificates
Begones: death certificates, records, obituaries, announcements, coroner's reports
Additional: cemetery and gravestone photos, photos of homes or workplaces, some rare family photos
I can access the notebook quicker than family files if I need to check on a birth, marriage or death date.
I could also add copies of the documents to the individual files, but haven't as of yet.