server.org: Update documentation for backup

doc/server.org

@@ -544,11 +544,23 @@ Disks failures or other events could have triggered a read-only partition.
 ** Making backups
   Performing an Analysis in Vidjil is time-consuming, therefore should the
   data be lost, valuable man-hours are also lost.
-  In order to prevent this we make regular incremental (?) backups of the
+  In order to prevent this we make regular incremental backups of the
   data stored on the vidjil servers.
-  This not only applies to the fiels uploaded and created by vidjil, but also
-  to the database.
-
+  This  applies to the files created during the analysis (either by a software or a human).
+  This does not apply to uploaded files.
+
+
+  To ease the backup, the =backup.sh= script provides an example.  For this
+  script to be ran automatically, it is required that =mysqldump= doesn't ask
+  for a password. The credentials informations should be provided in a
+  =~/.my.cnf= file (for MySQL obviously).
+  #+BEGIN_SRC conf
+[client]
+user = backup
+password = "strongpassword"
+host = localhost
+  #+END_SRC
+  It is also advised that the backup  user has a read-only access to the database.
 ** Autodelete and Permissions
   Web2py has a handy feature called AutoDelete which allows the administrator
   to state that file reference deletions should be cascaded if no other

[Mathieu Giraud]

idem, je m'en occupe