Hello,
I want to come back to the (safe) upgrading problem.
To upgrade a Wiki Brion Vibber wrote :
1) Back up your database
2) Grab the current code and put it in place of your old code
3) Follow the upgrade instructions.
In fact, I am unable to pass the first point :
Back up your database
I have not access directly to the database (which is on the access
provider site and I cannot use mysqldump commands) I can only manage the
database through phpMyadmin which is definitely not reliable.