I think wake-on-alarm is a feature of many recent motherboard manufacturer in the last few years. shuttle, pc chips, asus. on some gateway computers its called Real Time Clock Wake-up Alarm. it can also be called RTC Alarm Wake up and other names are used.
all variations of asus a7n8x including the deluxe and E-dlx have it listed in the bios labeled "automatic power up", It might also be called RTC Timer (real time clock). consult your mobo manual or list your make/ model.
power loss restart, if disabled, leaves your PC turned off is there is a power loss. if enabled, your pc will reboot when power is restored. you still need to use a UPS (uninterruptible power supply) backup if you want your computer and data to be protected in case of a power loss. yes you will lose any unsaved data unless using UPS. yes it's possible for your hardware to be damage if you get a power spike, but not from a power loss.