You cannot time travel to the past in real life with any known scientific method
No verified technology, experiment, or physical law currently allows backward time travel
If you want to revisit the past, use photographs, videos, journals, letters, and recordings
If you want to experience the past, study history, visit museums, and read primary sources
If you want to preserve the present for the future, create detailed records and backups
If you are asking about fictional or theoretical ideas, they remain unproven and not practically achievable