National Look Alike Day (April 20) is great for celebrating doppelgangers, but duplicate files and photos on your computers and phones aren’t as fun. Spend the day searching and organizing your devices for duplicate files that take up space and resources. Duplicate Cleaner for Windows has a robust free version that lets you find and manage documents, photos, music and other files that are scattered in different folders. On Macs, I use Gemini 2 to root out the excess copies.