I didn't list all the detailed specs because I didn't think it mattered nor would anyone be interested.
Windows XP SP2
AthlonXP 3000+ based PC
AAMC 9590SE-8MI RAID controller
4x 750GB SATA HDD comfigured in RAID 5
relativley small system HDD
The RAID controller deals with the RAID and WinXP is used with file sharing and RDC as well as P2P. I have nothing currently for scheduled backups. I had considered a second drive as the backup location, but that doesnt help if the system is the fault (MB, power spike, etc). I considered a second location (either a web share or simply a different NAS device located in the home.
Yes, I'm aware that the data would be lost with 1 more failure which is why I asked the question. After swapping a single failed drive, a day later the same unit had failed. Leads me to believe it's some other issue. If so, I need to consider migrating. I know what I've been doing is ok, but I figured others may have the same type of requirement and came to some setup that may be interesting. I don't want to get a new controller really, but RAID 6 was just starting to be available when I set this up. It was cost prohibitive for me at the time, but storage is so cheap now...
FWIW, calling a web server the cloud is trendy, but it's not new or inovative in any way. "Free" web storage is an option, but whether you pay for it or not, web shares are only useful while they are online. I've seen many disapear and the content is gone. What was the image share that ate many people's personal photo libraries a couple years back?