outlook mac 2016

Hi guys, bit frustrating I need to raise this question, as it seems such a simple ask. Looking for a decent mail client, which allows me to specify where it stores it's data. For obvious reasons, I don't want to keep large email archives on my macbook's drive. Outlook for mac or mac mail...

I run Outlook 2016 for Mac as my daily email client and receive a huge number of emails on daily basis. Due to this my mailbox fills up fast and I export all the emails I order to have a backup and I can retrieve any email later when I want to. However this time the export function stopped...