The annotations are stored in the database, so it really shouldn't be possible for you to lose the annotations without something extremely bad occurring. While it is possible to hide annotations on the main song display, they should never be hidden in the annotations editor itself. If you go to Settings->About, what version of MobileSheetsPro are you using? Do you ever use the companion application to make changes to your library, or do you make all your changes in the tablet app?
As far as restoring the annotations, it's not really easy at all to do that through a backup file. About the only thing that comes to mind (if you didn't want to lose your current library) is a multi-part process:
1) Back up your current library under Settings->Backup and Restore->Backup Library.
2) Restore your library from the old backup file.
3) Export the song containing the annotations by long pressing and select Share->Export as .msf.
4) Restore your newer library using the backup file you created
5) Import the .msf file you generated and update your existing song (or delete the song and recreate it using the .msf file)
In theory that should work. I'm not sure if there is another way to do this. If you have a second device, you could restore the library on that and export the song, and then just transfer the .msf file to the other tablet to update the song.
Mike
As far as restoring the annotations, it's not really easy at all to do that through a backup file. About the only thing that comes to mind (if you didn't want to lose your current library) is a multi-part process:
1) Back up your current library under Settings->Backup and Restore->Backup Library.
2) Restore your library from the old backup file.
3) Export the song containing the annotations by long pressing and select Share->Export as .msf.
4) Restore your newer library using the backup file you created
5) Import the .msf file you generated and update your existing song (or delete the song and recreate it using the .msf file)
In theory that should work. I'm not sure if there is another way to do this. If you have a second device, you could restore the library on that and export the song, and then just transfer the .msf file to the other tablet to update the song.
Mike