I'm not familiar with Samsung but if you're using MangaRock app like me, then there's an easy way to backup your favourites. I have an account on the app and all I need to do is sync and back up. When I changed phones, I did it and just logging back in and syncing got all my 1000+ bookmarks automatically and reading history for the last 10 days. Unfortunately, my history was way more important than my favourites so I did the long old, opening the manga again till it appeared in history for the past 1 year. I swear it took me weeks...but I have them at one place.
Sorry this is not of much help...I'm a technology noob.
The system storage of my fone is running low so I've decided to format it....Please tell me a way in which I can backup an app I hold dear...A manga app ofcourse....And also how should I back up my book marks....I use a Samsung Galaxy Note 3 neo...
PLEASE HELP ME !!