Does import overwrite existing list subscribers or append to them?

[ggwwbb]

Headline says it all: If I have list X with 100 subscribers and a CSV file with 100 more that I want to add, is the correct method:

* Import them into the existing list; any duplicates will be removed and existing subscribers won't be touched

OR

* Export the existing list, merge them in Excel, then re-import the now-combined list?

Thanks!

 

[twisted1919]

Import them into the existing list; any duplicates will be removed and existing subscribers won't be touched

Somehow like this, except existing subscribers will be updated.
Keep in mind that mailwizz strives to have no duplicates in your list.