Duplicate security dongle, company out of buisness

I am looking for someone to help me duplicate a security dongle for my system - the company who originally provided the dongle has gone out of business. I am looking for a hardware-based solution, rather than a software- or cloud-based one. I do not need regular data backups, but I do need the system to be compatible with any existing systems. I'm sure whoever tackles the task will have an interesting and exciting challenge ahead!