"Our Brain" a metaphor for "Computer"?? or vice versa

Heard this funny but true statement from a drama series ...

(translated from Cantonese)
" Our brain is like a computer, however, this computer can only have a
certain RAM, it cannot be upgrade to a larger capacity. Hence, we need
to dump the unnecessary memory and fill it all up with the happy
moments.
Forgot about the pasts..."

I guess this is all we need to be able to live strong in this world.....