Migrants to IJ, 2007

I forget where I saved this information or where it is, but I want to be sure before I do anything.

I archived everything back in January, then imported it all with LJ-sec.

My question is: I want to archive my IJ regularly. Do I need to make a new folder/name for each time I do this? Or do I actually *want* to overwrite my older file, seeing's how I've added to it?

What do you-all do? What is best?

I promise I will put this post and all its replies in my Memories!! :-D

Thanks in advance!