Any common issues to know about?

I was thinking about getting Nebo/MyScript for taking my vocationary school notes. I've done some test scribbles and the app seems to be exactly what I was looking for. So are there any issues I should know about and what things to avoid? Do cloud synchronisation work reliably? Are there any issues when backing up notes, which might cause them to revert to an earlier state (happened to a friend who uses a different app, she lost everything she put down that day because an older backup overwrote her notes).