If thats true I would really consider switching to roadrunner, 7mbit in my area but only 500kbit upload, while i got 3mbit 765kbit right now with verizon. So newsgroups would be much nicer, but uploading would be worse.
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You will have access to the most recently uploaded files, but RR may or may not carry all MP3 groups.
I don't know how long the RR retention is, but I doubt it is longer than a paid usenet server. Therefore, if you're looking for stuff that was uploaded a couple of weeks back, you might not be able to find it.