Hi Maria,
Welcome to the AtoM community!
Unfortunately, AtoM does not have any automatic backup of deleted records. This is one of the reasons why the user interface will always prompt you to confirm when trying to delete records.
Your best option is to load a database backup, if your IT support is taking regular backup snapshots (something we always recommend for a production environment!). If you have a database backup, it can be loaded as described in our documentation in the following locations:
If you don't have any backups of the database, then unfortunately you will need to manually recreate your subfonds in AtoM.
Regards,