How I can backup my edited files?

By using iTunes's backup, all Piascore's data is backed up.

So you can transfer the data other iPad / iPhone (for recovering iPad/iPhone)

1. Updates your Piascore to latest version
2. Launches Piascore once after updating
3. Connects iPad to PC
4. Launches iTunes and backup all data on your iPad
5. Connects another iPad / iPhone to PC
6. Recovers the iPad / iPhone from backup data
   • (Caution : after recovering, the previous data on iPhone / iPad will be erased)

Or you can export sheet music as a new pdf file including writing down notes. Please see below.

How to mail & print a music sheet on iPhone.