"Off-site conservation" is referred to as ex-situ conservation.
It is the process of preserving an endangered plant or animal outside of its original environment, such as by removing a portion of the population from the ecosystem and relocating it to a new area, such as a wild area or under human supervision.
While some of the most traditional and well-known conservation techniques are ex-situ.
Seed banks:
Example of ex-situ conservation is the seed bank.
Seed storage is necessary to protect the genetic material that plant breeders need to improve production, disease resistance, drought tolerance, dietary quality, taste, etc.
Final answer: An example of ex situ conservation is seed banks.