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Use official Android Backup for Android 6.0
The backup to Google Drive and Dropbox is nice, but I think that a backup using the Auto Sync API introduced with Android 6.0 would be the easiest way to go about backups from now on.
Customer support service by UserEcho
As far as I know, a special designed android file backup app could transfer everything from your phone to computer, and you don't need to root your phone, just need enable usb debugging on your phone.