I was having a few issues with this site (since resolved), but one thing I noticed was the space allocation seems a bit off. The Total used is 6G out of 10G (which is possibly about right given it backed up a large zip file). However the graph underneath and the stats seem to be confusing the break down and the totals. So Production Files shows 5.5GB (both in the text and the graph) - a dh shows about 2.2 GB, with the backup overhead being 3.3G (I obviously can't check that ), this is shown separately in the text and the graph, now 2.2 + 3.3 is the 5.5G mentioned as production files (and the rest of the breakdown would then add up to 6G). The graph shows them separately as well, so what should be a 60/40 split on the graph is actually closer to 90/10.
The Staging is actually deactivated but has some minor space (about 121 MB) allocated.
Lastly the DB storage is set at 874M, now I understand this is probably calculated from the filesystem, but if I go to phpMyAdmin the DB is only listed as 50M, this overhead seems a bit much.
Overall the total seems about right, but the breakdown seems to be a bit "confused" so it may be worth taking a look.