I would like to automate, with applescript, the back up a mailbox of mail, which is manually done with the menu "Export mailbox ...", but: I can not set the folder where the mailbox will be saved; I can not set the mailbox to export, it works only with the mailbox that I've previously selected manually with the following command: Click menu item...

The lines of the script, which does not work, are:

tell application "Finder"
  --set mboxSavePath to "HD Macintosh:Users:simonepiersigilli:Desktop:e-mail:" -incorrect command to set the save path-
  --set mboxSavePath to "/Users/simonepiersigilli/Desktop/e-mail/" -incorrect command to set the save path-
  --set path POSIX to mboxSavePath -incorrect command to set the save path-
end tell
tell application "Mail" to activate
tell application "System Events"
  tell process "Mail"
  --click menu item "[email protected]" of menu "Entrata" of menu "Caselle" of menu bar 2 -wrong command to set the mailbox to export-
  click menu item "Esporta casella di posta…" of menu "Casella" of menu bar 1 -correct command to open the menu "Export mailbox ..."-
  -- Now click the Go (choose) button
  click button "Scegli" of sheet of front window -correct command to click the button choose-
  tell application "Mail" to close the front window
  end tell
end tell

UPDATE**

The intention is for the script to be run every week and it will have to backup the following inbox and sent mailboxes highlighted in red.