Anyone know where memos are stored on a Samsung Galaxy S6?
Let's see: The package name of the Memo app on Samsung phones is called com.samsung.android.app.memo.
There is no such folder in sdcard\Android\data, so it has to be in /data/data/.

And how correct I am:
Using adb shell and giving myself root access (su) to access /data, I am able to explore my own private data.



Now let's look inside and we find a databases folder with a memo.db inside:



Using some simple SQL and sqlite3 we can take a look inside the database itself:



There are our memos. Note that they are also saved as XML including any extra data needed for the app itself.


  Yes you need root access or use Samsung's backup tool to make a backup of your memos.