RAID 1 is certainly great for helping you retrieve your information if the main hard drive fails.  Using a mirrored RAID can be a great choice if that happens but what about other situations?  It will not prevent malicious software issues that come upon you and attack your system, like viruses.

Why is RAID 1 a bad choice during those times?  Because, the way it works is to copy each and every file from one hard drive to the mirrored backup drive.  If the virus or malicious code is on your main drive, you get it twice, because it copies directly to your backup drive.

Your best solution in these cases, if not just drive failure, which RAID 1 is perfect for…would be a third-party application like Pexagon Technologies has available on the Store-It Pro 2.5″ Portable Hard Drives because you are choosing when to backup your information (with the press of a button) and you can choose only the most valid information to be stored (photos, music, documents) in case of a system crash due to a virus.