Thank you for your quick answer !
I found how to do the backup but expot didn’t successed.
I made some screen before I click on [Backup/Sauvegarde] Button, but the file is only 14o and lot of errors/warning (see up) are generated.
I will have a look to phpMyAdmin, It will be easier I think, and respect the way of intermediate upgrade you give me.
Thank you again,
