I suspect your are at the very least confusing terms
and it is best get this out of the way before addressing your problem.
RAM is Random Access Memory - there is nothing stored there- this simply holds data whilst being processed and one powered down all data fades away.
Back up files if that is what you mean
[though once more I am not sure I get your drift] has two options - if you want to keep them - then burn them to a CD
If they are not important to you - delete them.
Can you describe in more detail what you are seeing.
But are you sure they are 'backup files'?