You don’t need to worry about your data anymore, just take backup whenever you want.
Here is how to backup your data:
Open TeacherKit
Tap on the sidebar, and choose Settings
Tap on "Backup"
Choose which source you do prefer to backup your data on (iCloud or Dropbox)
Using iCloud:
Choose "iCloud"
Tap on "Backup Now"
Using Dropbox:
Choose "Dropbox"
It will require from you to login with your Dropbox account
(If you don't have an account, here is how to create one).Login with your Dropbox account
Tap on "Backup Now"
Your backup file is saved in your Dropbox account (Path: "Dropbox > TeacherKit > Backups")
Notes: