For save management, Checkpoint is recommended. It can be used to back up and restore game saves to your SD card.
Edizon is also a save manager but has the ability to edit saves for extra items etc. It also has support for Atmosphere's cheat engine, providing an easy way to download new cheats, as well as toggle them on or off.
Please read Checkpoint's usage page for information on how to use it.
Please read Edizon's homepage for information on how to use it.