Do you trust a sperm bank to properly store your semen for 25 years and give you back your sperm on demand? Have you read all the stories of sperm banks screwed up? The old fashioned sperm quality control methods usually work better.
Store it at more than one place, it’s not that expensive and if you are in the capital class it’s such a small part of discretionary income as to be insignificant. Even with a vasectomy you can surgically extract semen and find some viable swimmers it’s not like the testies stop production totally even with a vasectomy blockage.
https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/sperm-retrieval-procedures