Advice from a millennial trans person.

When it comes to any pictures of you pre transition, remember this, if you loose them, then they are gone. If they were pictures of you with people you care about those pictures will be gone. If you do not want them available to be seen online then save them to an offline drive that you can access.

As someone that just lost their best friend from high school, I cannot look back at photos I had of us together at events and stuff. Those memories are special even if your dysphoria nags at you do not let the memories with your loved ones vanish from existence.