You need a good portable picture scanner to digitize your stuff nicely. The action items are photos, CDs, DVDs, documents, signing up for online backup and trashing the remaining physical items. You should scan your photos and store your CDs and DVDs on your computer. Don't forget to scan the important documents too. Then store everything digitally using online backup. The items that are safely stored and just take space should be donated, sold or even thrown away. You could of course choose to keep sentimental items that have a special value for you as those might be irreplaceable.
San Diego Photo Album Scanning: Preserve Your Dear Memories Today
San Diego Photo Album Scanning: Preserve Your Dear Memories Today
Source: http://www.theminimalists.com/21days/day14/