The records of our past lives (Akashic records) are stored in the Akashic Library, a nonphysical compilation of every thought, deed, and action of every soul since the beginning of time.
One way to retrieve past life information is through a disciplined mind, one able to quiet the conscious mind and move within to the subconscious mind.
Edgar Cayce (1877–1945), the sleeping prophet, was able to put his conscious mind to sleep and retrieve past-life information through his subconscious mind.