The Benefits and uses of an Address and Contact Book Do You Need An Address Book? There are many ways for someone to manage the information of their friends, family and business contacts. One of the best methods is to maintain a current address book with all the contact information readily available in one spot. Address books can be in either a digital or hard copy format, or both. The choice is up to you and your needs. If you do decide to keep a digital copy, then it is important to also have a backup. One of the best things of having a digital address book is that it can be taken with you very easily. It is best to pick whichever works the best for you.