What is ClockworkMod?
ClockworkMod is a third-party recovery system for Android devices. It provides many backup, restore, and maintenance features that are not present in the "stock" Android recovery system.
ClockworkMod, having performed a Nandorid backup (source: XDA)
- recovery-mode: the generic tag for all stock and custom recoveries
- twrp: Team Win Recovery Project is an alternative custom recovery
- backup: as from the custom recoveries, one can create/restore Nandroid Backups
- nandroid: a backup type offered by ClockworkMod and other custom recoveries, but not by stock recoveries