Problem with automated backup courses after parameter changes

Hi,

Here's the problem i have on a Moodle 2.3.8 :

Automated backups have always been configured like that :

• backup_auto_storage : Course backup filearea
• backup_auto_destination : empty
• backup_auto_keep : 2
• backup_shortname ticked

I've modified like this 2 days ago :

• backup_auto_storage : Specified directory for automated backups
• backup_auto_destination : specified to a directory where apache has write perrmissions
• backup_auto_keep : 1
• backup_shortname ticked

After launching again automated backups (via cron), here's what happen :

• new backup files are well created in specified directory on disk
• but when looking at available backups (clicking on "Restore"), i still see old backups, and not see the new one 

I've copied (a saved copy of) the moodle on another (test) server, updated it to 2.5.1+, and made the same changes and tests, with the same results 

Would like to know if other people have the same problem... and a solution ?

Séverin