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Kerio Connect is not just a mailserver but it also stores your contacts, tasks and calendar in the cloud with the ability to active sync to all your devices. Pushing notifications and changes in your calendar to your collegue or partner is one of its great standard features. The 'backup/archive' function is an administrative function that is done at the server level. Kerio does not provide any mechanism to do client level backups from the client. Client side backups of mail are somewhat of a moot point, since the client never permanently downloads messages from the server.
You need to use SMTP auth with a Kerio server, Kerio is not Exchange. Whether or not authentication is required depends on your Kerio settings.
Check the SMTP Server configuration on your Kerio server for the correct config to use. If you are permitting relay for an IP group, and your Spiceworks box is in that IP Group, then you should not need to authenticate (but this is a very BAD idea, IMHO). Instead, you will want to check the box to allow relay for 'Users authenticated through SMTP for outgoing mail' and make sure you have created a Kerio account that is dedicated to Spiceworks. In Spiceworks email settings, check the 'Requires authentication' box and enter the username & password of the Kerio account you created for Spiceworks.
I currently use Spiceworks with a Kerio Connect 7.3.2 server and have been since we were running Kerio Mailserver 5.something. It does work, if you make sure the backend settings are there. Let me know if you need any additional assistance on configuring with Kerio!