Malware like DroidDream unfortunately is a real threat to Android devices; here are some essential security apps to help secure yours
Titanium Backup PRO Key
While mSecure Password Manager specializes in saving key financial and personal data, Titanium Backup aims to back up data for just about every application you have. You'll also be able to use this app for encryption, batch verification, and application freezing. There's even an experimental "Bloatware Melter" that's designed to cut down programs that take up too much space and memory.