Update backup

Won't create backup dir without this sudo

scripts/backup

@@ -4,7 +4,7 @@ app=ynhexample
 # The parameter $1 is the backup directory location
 # which will be compressed afterward
 backup_dir=$1/apps/$app
-mkdir -p $backup_dir
+sudo mkdir -p $backup_dir
 
 # Backup sources & data
 sudo cp -a /var/www/$app/. $backup_dir/sources
@@ -12,4 +12,4 @@ sudo cp -a /var/www/$app/. $backup_dir/sources
 # Copy Nginx and YunoHost parameters to make the script "standalone"
 sudo cp -a /etc/yunohost/apps/$app/. $backup_dir/yunohost
 domain=$(sudo yunohost app setting $app domain)
-sudo cp -a /etc/nginx/conf.d/$domain.d/$app.conf $backup_dir/nginx.conf
+sudo cp -a /etc/nginx/conf.d/$domain.d/$app.conf $backup_dir/nginx.conf