Records of our past remain intact “forever”

Hi Lal and others:

In many posts you have stated that our past memories remain intact in a “mind plane” forever. So we are able to recollect past lifes as far as we can by accessing that resource.

The reasonable question that comes up is: 

A) maybe you probably used the colloquial sense of the word “forever,” meaning really long, long time, but not eternal.

That would imply even a Buddha can’t trace a beginning even if he wanted to.

B) time doesn’t exist in the mind plane, so there can be “eternalism.” 

That would imply the mind plane is “not a part of this world.”

To which of the two points do you adhere?

Regards