chose whether you want to store your backups on the device or on dropbox. If you backup to your devices internal memory, you can transfer the backup file via iTunes („your device name“->Apps->Japanese LS) to you PC/Mac and from there to other devices.
give Japanese LS access to your Dropbox so it can store backups there. The app will not have general access to your dropbox data. There will be a folder created „Apps/japanesels“. This the only folder Japanese LS will have access to.
Restore selected Backup (current date on device are overwritten)
Create a new Backup
Delete selected Backup