zerbib on "[Plugin: UpdraftPlus - WordPress Backup and Restoration] UpdraftPlus not working ?"

Hi ! When I make a backup of my website,I've this message :
"Warning : we have found a very big file 1.9Go "
and nothing else happens !!! even it'is mentionned that the backup was OK and complete !!!
I apologize for my bad language:be kind with a french newbie
Bests Bibo

http://wordpress.org/plugins/updraftplus/