Galaxy S7 - How to back up stored email mailboxes with ADB?

I've been through several threads on Stack Exchange / XDA to find a solution that yet eludes me for the following task : As we all know, when we create an email account with our Android device and use the default email app, in my case **Samsung Email**, the synchronized emails are stored on our phone, in my case (**rooted** Samsung Galaxy S7 edge - Android 7.0), in this location: /data/data/com.samsung.android.email.provider/ with folders : The idea, from what I have read, is to back up all those folders and the databases stored within them with ADB and then use SQLite tools to convert the databases into usable/readable information. The problems I have encountered until now: - when I use ADB backup function, the stored backup is less than 1kb size, meaning the backup didn't work, this can be the result of the wrong app name or no Allow_Backup Flag on that app (system app) - I have used several tools to get the exact name of the app, in my case com.samsung.android.email.provider or com.samsung.android.email.provider-1 but still no result - I have tried to use the backup -all command, and that's how I realized some apps were not backed up in the resulting file, including the email app for my device. - I have read that in order to backup an app, it needs to have the ALLOW_BACKUP flag, and the app (system app) does not have that flag What do you think? what should I do from here? (Important: the idea is to extract/backup the whole mailboxes and be able to access the contents of these mailboxes on a Windows/Mac mail client. I have no use for the 'export email to file (.eml)' available in the Samsung app, as that would require to do it for each email one by one). Sources: - Android email Extraction - How to backup with ADB - Backup problems - Backup FLAG info - SQLite database use