I want to setup a server that runs Arch Linux commandline. Its duties would be file storage (Maybe backup) and BitTorrent downloads. I have tried in the past to try and get it working but wasn't completely successful. Can anyone help me with what packages/how I would go about setting it up?

Well, I have always been quite partial to rTorrent and setting it up to run as a daemon. There is plenty of documentation on how to do this.

As for a GUI front end, you can use NTorrent, but there are several other alternatives listed here: http://libtorrent.rakshasa.no/wiki/UtilsList.

However, when I set up rTorrent on a server of sorts, I would just leave it running, having it configured so that it would monitor a directory for torrents (a torrent repository, if you will). On any other computer, I would mount that torrent directory, over the network, through sshfs and when I downloaded a torrent, would just drop it into that mounted directory.

I hope this helps.

I'm told Transmission's CLI incarnation is trivial to setup with a WebUI, but I've never done it myself.

Nor have I, hence I suggested rTorrent. It's not as easy to use as Transmission, but if you rarely have X running, like me, it's really the best alternative.

Thanks for the replies. Yes, I had a lot of troubles trying to get a CLI BT working previously, I'll try them again tonight when I install Arch again.

If you go to the rTorrent website, there is an easy-to-find page that gives you an absolutely wonderful example of a configuration file for rTorrent. In all honesty, I copy-and-paste that example every time I am setting up another "torrent server". The only things I change are some of the schedules, quotas, share ratios, and the names of the directories. It's a very helpful example.