Backing up an external media drive.
I have a 1TB external SSD that I store media files (photos and music) on. It is a large collection and would not fit on my main drive. What options do I have to backup these files. I assume that Time Machine only functions for my main drive. I do have a NAS connected to my computer (2020 M1 Mac Mini 13.5.2. One section of it is synced with another NAS at my daughters home in another state.
Mac mini, macOS 13.5