Hi,
Yes, Gramps 3.4.x has also backup as option for export. It equals the Gramps xml option without the questions on filtering.
Note that you must backup your media files (pictures, ...) separately then.
Huh?
 
In my copy of Gramps 3.4.2, backup has two options:
1. with media to .gpkg
2. without to .gramps
 
With 1 as the default, it looks like this is all one needs to do. I haven't fully tested it though.
 
cheers,
 
Enno