I have two identical HDs in my PC and periodically, I back up from my primary drive to the slave to keep copies of modified files current. Is there anybody here using a software-based Raid or Mirroring solution to keep a HD duplicated in real-time (or perhaps batched overnight, etc)? I'll probably have to upgrade PCs sometime in the next year or two and would prefer not to get locked into a hardware-based RAID1 solution, if possible. Is there an easy-to-configure software solution available - preferably a free utility? I can probably stand a hit in productivity since I'm not a gamer, and I'm not running any real processor-intensive applications. Thanks in advance if you've got some suggestions!