What do you suggest? i dont want to loose my files. I have Music, personal Photos, and even Personal ISO copies of Linux, and copies of all my windows installers as for some reason DVD's go bad in my house fast.
I backup plan is needed if you dont already have one. I would not trust all my data to just a RAID array. yes it will protect from a single drive failure, but if bad data is written back, you are essentially corrupting both copies of files. That is where shadow copy is helpful, however connecting to a NAS or USB External Drive every once in a while to backup an exact copy of all your most important data is best.
I run RAID, Shadow Copy, and well as I backup on occasion to 4 x 32GB USB sticks. My data that is most important is 23.6GB right now. I have the USB sticks marked A, B, C and D and Perform a weekly backups every weekend with a batch script that targets where I store my most important data with an exclusion list to skip certain files etc. So this week I back up to Stick A, then next week Stick B and week after that C and then week after that D and then week after that OverWrite Stick A, and then B C D and cycle repeats. I can essentially get data that is almost a month old and USB sticks are cheap. The more data you have and depending on how important it is to have multiple points to go back to will determine the cost associated with data protection this way.
Its not perfect as for if something got corrupt say back on January 13th, and I run the backup today for Feb 15th, and overwrite the prior backup that had that file not corrupted and found the issue today, I am out of luck.
However I also my most important files that dont take up much space at all which are my programming projects and source code etc backed up to an online cloud for free and have folders for each backup date so I can go back quite a ways if needed, although most programs are easy to reconstruct if needed not too difficultly.