[Koha] Help urgently needed

Kia Ora I work at a volunteer library and we have been running Koha for just over 2 years. Until now everything has gone well until Friday afternoon. The system seems to have lost all but the first few items of data entered in 2022. All the reports come up blank and searching books and patrons also does not work. We can't use the system to issue or return books. We do not have anyone with experience setting up software so it would be good if someone with major knowledge could log in to the laptop. Thank you for any help Angela Davies