1- Throughout the day, as long as the server is running.
2- During the backup window, which you set in the Console. Each PC is backed up at a randomly-selected time in that window, so long as it's on (or in standby/hibernation/sleep, if you've configured it to wake for backups), and on your LAN.
3- Yes. The backup window can be changed in the Console. This affects
all computers.
4- No, computer backups are not backed up themselves, nor are they duplicated. However, as Ken is fond of saying, the backup database is essentially fungible. If you lose it, you'll simply recreate it from the PCs themselves after you've recovered the server.
5- The only 'con' that I can think of is network latency (if you have issues), as well as the fact that if the server isn't running, you don't have access to your files. However, it does work - I have my sister's user folders redirected to her share on the WHS, primarily so that she can have access to her docs from offsite (say, school.) And, you're correct in your assessment - if your redirected folders are on a duplicated share, then, yes, they're duplicated across two (or more, depending on your config) hard drives.
You should read the technical briefs on WHS, too:
Remote Access
Drive Extender
Backup and Restore
Media SharingHTH,
Chris
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