Titanium Backup is the most powerful backup tool on Android, and then some.
You can backup, restore, freeze (with Pro) your apps + data + Market links. This includes all protected apps & system apps, plus external data on your SD card. You can do 0-click batch & scheduled backups. Backups will operate without closing any apps (with Pro). You can move any app (or app data) to/from the SD card. You can browse any app's data and even query the Market to see detailed information about the app.

PRO Features Added:
[✔] Multiple backups per app
[✔] 0-click batch restore
[✔] Backup/restore SMS,MMS,calls,bookmarks,Wi-Fi AP as XML
[✔] Multi-user support for some apps! (eg: games)
[✔] Batch verification
[✔] Backup apps without closing them!
[✔] Create your own update.zip containing apps+data!
[✔] Restore individual apps+data from non-root ADB backups!
[✔] Restore individual apps+data from CWM backups!
[✔] Restore individual apps+data from TWRP backups!
[✔] Hypershell speed
[✔] Migrate system data across different ROMs
[✔] Market Doctor (relink apps to Market)
[✔] "Destroy all Market links" feature
[✔] Apps freezer (incl. batch support)
[✔] Market "auto updating" manager
[✔] Convert user apps <=> system apps
[✔] Encryption
[✔] Unlimited schedules
[✔] Sync to/from Dropbox (manual/scheduled)
[✔] Sync to/from Box (manual/scheduled)
[✔] Sync to/from Google Drive (manual/scheduled)
[✔] TB Web Server: download/upload your backups as a single ZIP on your computer
[✔] Load/Save a Filter and use it in Widgets/Schedules
[✔] Change the device's Android ID, restore it from a backup or after a factory reset
[✔] Protect backup against deletion
[✔] Send backup (to e-mail/cloud) and import it in 1 click
[✔] Backup→Verify→Un-install an app in one shot
[✔] Freeze/defrost/launch apps in a single click
[✔] CSV export any app DB (e-mail or Google Docs)
[✔] Brand the app with your name
[✔] Bloatware Melter (experimental)
[✔] Convert app data to/from faster WAL DB format
[✔] And more!

More Memory:
[✔] Dalvik cache cleaner
[✔] Integrate system app updates into ROM
[✔] Move apps into ROM
[✔] Integrate Dalvik cache system elements into ROM