Export of achived mails?

I just used the auto-archive option to free up a huge amount of space on my mail server. I can see the archived mails in my em Client postbox. All of this looks great. However, I run emClient on two computers. Is there any option to move the archive from one computer to another one? And thinking a bit into the future: What if I would ever want to switch my email client (dare me…, but sometimes one is forced to use a specific software). Is there an option to backup/export specifically the archive? I may need to import the archive to any other mail program (e.g. Outlook) at some point. Thanks for any advise.