Save Management
For save management, JKSV is recommended. It can be used to back up and restore game saves to your SD card.
Checkpoint is also a save manager. It can be used to back up and restore game saves to your SD card. It also has the ability to share save data over FTP and WiFi.
JKSV
Please read JKSV's homepage for information on how to use it.
Checkpoint
Please read Checkpoint's homepage for information on how to use it.