Spending the last 3 days and 2 nights trying to repair my windows home server without any luck (lost 1,6 TB of data

My specs:
GA-EG31M-S2L
Intel E5200 C2D
2 GB RAM
1x 250 GB HD SATA
3x 1 TB HD SATA
1 Realtek NIC (onboard)
My questions:
1) Is this hardware supported?
2) Can I use the 250 GB HD as a system boot drive and use the 3xTB HD in a software raid 5 configuration?
3) Do I need 2 NIC's for the server?
4) Is there something like the WHS Hompage available so people can access shared resources over the internet? or do I have to setup something like a ftp server?
5) Since I am using a mix of windows os (W2K3,W2K8,Windows 7) - how can I backup/restore (bare metal restore supported)? Incremental backup supported?
6) Do I have to install any Backup client on my clients and will it be compatible with the OS mentioned above?
Sorry if I ask questions which are probably answered some where in the forum but honestly I am too tired to search and read all the documents after the last three days. Please bare with me... I will read the documents and postings but for now - if some one can provide me with short answers I would appreciate very much...
Thanks in advance for any answers, hints and suggestions ...
Regards
BitRausch
Germany