THANK YOU in advance for helping.

Within Blockchain wallet I had a couple addresses archived. I then unarchived one and the website promptly emailed me a backup to my wallet should I need it someday.

My question is this: the backup that I had of my wallet from a few days earlier (which had that one address archived)....is it still any good? Can I still use that backup from a few days earlier to access my addresses (active and archived ones)

I just want to make sure I'm good in the event I put a USB stick of my backup in my safety deposit box. It seems like it would become annoying to replace the file on that USB stick everytime I "archived" and "unarchived" an address

I guess I'm just confused when I need to replace the backup file on my usb stick.