Don't think the player is working @ top right of each stream's dashboard yet (you listed it in the latest update)-- but only with SHOUTcast 1 & ICESCC --- not sure about Icecast
How exactly does it fail to work?
On Centova ADMIN main screen, the total server space is @ 1G on mine, should be more like 30G....
Mouseover the disk space meter for an explanation of what the values mean. It sounds like this is working fine.
Also would love to know a little more about how your planing to do the backup feature, I see you mentioned it in release notes for the latest release but couldn't find anything... is this going to be a command we run, will it be per account of all accounts at once (I really wanna know if we can earn more $$ off it LOL --- please tell all!! 
It's a per-account backup system.
You can already back up all accounts at once simply by dumping your database and taking a copy of /usr/local/centovacast/var/vhosts (and a script to automate this, named /usr/local/centovacast/sbin/simplebackup, has been included in v3 since the first few beta releases) so that's nothing new.
Not sure what more I can say about the per-account backup system -- it's basically what you'd expect, I think.
You run a command from the commandline specifying the username to back up as a parameter, and it extracts all of that account's information from the database, then creates a zip file containing the database data and the contents of /usr/local/centovacast/var/vhosts/username. You can restore it wherever you want -- on the same server, on a different server, etc.
The reason it's essential for v3 is because v3 won't have a "upgrade" option from v2, per se -- too much has changed. Instead, you'll import your accounts from v2 into v3, which will basically involve creating a backup of each v2 account and restoring it into v3. That's on its way.
Centova Dashboard Flash Player & Total Disk Space Graph