Firstly, holographic memories of every experience we have ever thought felt or perceived are retained in the mind, it is the casual conventional access to these memories which is poor and degrades over time. Additionally, most minds corrupt the original every time they turn the memory in the mind, as those neurons are creating new memories of the recall augmented by their introspection.
The mind is a technology by which each and every one of us must auto negotiate, and some have hereditary or developmental advantages.
In addition to all of this, which you will all in mass outright deny, we are not alone in our own minds. There is an immense culture among us, an “underworld”, clues of which span back as long as civilization of those who have mastered the ability to travel among our minds and manipulate the consciousness of others. These are an unruly mob of tricksters responsible for many difficult to believe yet personally authentic experiences of others. These are often referred to as “entities” or “guides” while being quite human.
Lastly there are stories (of which I have told) of those off worlders we refer to as Greys who may navigate the hyperdimensionality of time through their minds, yet this is beyond the means of human minds. It is much more likely to be a curated game (such as the CIA Stargate accounts.)
The true mysterious secret is that our consciousness may entangle and we are not alone in our own minds! And holographic memories are a part of our consciousness.
Apparently the condition is called hyperthymesia.