I am removing my entire under dash harness due to a meltdown and had taken several hundred photos and used the voice-to-text Siri feature to talk into my iphone and had created PAGES of notes into the Notes application. Today I went to continue and MY NOTE IS GONE. Photos still there but all my "red wire, white stripe goes to terminal on top left" etc type notes is gone gone gone.
If you use iCloud to store your notes, and you delete a note (or your device somehow deletes a note), you can't get it back. And i just got back from hours with Genius Bar, Apple Care chat and phone support only to learn they can't get it back either.
You would think a restore from iCloud backup would bring back the note, but it doesn't. Apple admits that Notes are handled different somehow, and can't be restored from the cloud. When a note is deleted from one device, that delete goes up to the cloud and the cloud then synchs up with your other devices and deletes the note on them, too. You can try restoring your ipad or iPhone from backups, and I did, but it doesn't restore the note. The irony- I was using the cloud for backup safety... and if I just used my phone's memory and not the cloud, I could have restored them from a previous backup.
Even my iMac desktop, which does a daily backup to the Time Machine Airport Express, doesn't back up the notes on the computer... because they're not really on the computer- they're on the cloud.
Until they aren't.