Hi @daphnemann,
Welcome to the Community.
Almost all data within Klaviyo can be exported including your lists, segments, campaigns, flows, email templates etc. To do so, I would suggest taking a look at some of the articles I linked below to get you started:
When an email recipient unsubscribes from a list, they are removed from that list. However, when someone unsubscribes from a flow email or email sent to a segment, this person becomes suppressed in the sender's Klaviyo account. The user is considered globally suppressed, meaning their profile will remain intact and appear in lists, but they will no longer receive emails. That option, as stated in the name, would remove globally suppressed and unsubscribed profiles from a list, so your list contains only active, emailable profiles.
Thanks,
Alex