EasyNews

I have been a member for 15 years - and although I do honestly have to say it is not as good as it used to be, it still is better than the others. It has a web interface that allows you to select files as needed - no need for a separate newsreader like the others.

Retention is over a year - many groups much longer. Also have virus checking, thumbnails, and automatic file merging.

Where it lacks - if you ever get to need it, is the very average Support. But probably only ever needed it a dozen times over the years.