Deja-dup (now Ubuntu Backup) is just a GUI for duplicity, therefore it should store the config files somewhere. I would like to changed the backup volume size to something like 300MB and the increase the --full-if-older-than variable. is this possible?
This has changed in various Déjà Dup versions, but I believe it is currently at:
What can't you change using the GUI front-end?
The settings used to be stored there, and the files are still present.
In more recent version they are stored in:
Instead of using
dconf-editor, you can use
gsettings from command line.
See all the options (keys) within the Deja-Dup schema, and their configurations:
gsettings list-recursively org.gnome.DejaDup
gsettings set SCHEMA [:PATH] KEY VALUE
gsettings set org.gnome.DejaDup include-list ['$HOME']
fwiw, added a dconf setting if you build this from source, it will create a volsize setting in org.gnome.DejaDup. you can change it to 500mb with dconf-editor.