Answer:
First: read this:
Kimsufi support is changing.
Now, when this is settled, and you understood that on this forum there are no KS employees anymore, I, as a KS client, I'll try to answer your questions.
1) No way. KS stands for KimSufi, some kind a dialect french that says "Enough for me".
This means : YOU admin your server. You organize a backup plan. You keep care of your data. You handle your software. Whatever, you deal with it.
KS, on their side will power your server, keep it connected to the net, and change hardware when its needed.
2) No monthly traffic limit - they (KS) do not guarantee a 100 Mb bandwidth, but you take what you want without limits (keep in mind, your neighbor servers might do do the same thing )
3) See 1) - you do with your setup, your drive, whatever you want.
Anyway, KS is considered as a play and learn server. So, go ahead It is NOT an or other 'virtual environment' like a VPS - you are on your own device, as big as a packet of cigarettes - the drive is even bigger.