Stamattina,ho aperto Lightroom e non l'ho trovato come l'ho lasciato pochi giorni fa dopo il Backup.

In Lightroom, click on /help/about lightroom/, copy and paste that info into a reply.

You should always KNOW what folder the backups are in. I keep my Lightroom Classic backups on the V: drive in a simple folder at the root level named Lightroom Backups. By doing this, there is no difficulty in finding the backups. Putting the backups in a folder with a more complicated name, several folder levels deep, makes your job of finding backups much more difficult.

You can also use your operating system's search feature to do a search of all folders on all disks for files whose name begins with your catalog name and ends with .ZIP, there are most likely the catalog backups.