How can change Full=1 to Full=2 or another value (to increase de time between full backup)
Welcome to the forum @pedropinto
Duplicati 1.3.4 from 2013 has been unsupported for years, but maybe a user will know. For self-help:
Old web site which still exists but some of whose linked resources no longer work…
1.3.x help.txt possibly also availableif you run duplicati.commandline.exe help
CommandLineHowto from Internet Archive
Suggest you consider using Duplicati 2.0 however you would have to start again with a fresh backup.