As Rogue77777 stated you need at least three drives for raid5. And to get a real advantage you should use a dedicated raid controller, not the raid function of your mobo. It's not easy to get a raid running, but it' way more complicate to get the data back, when it fails!
If you don't want to lose your data, a solid backup strategy is more important. Get one or two external drives and make redundant backups of your files. Or backup to a cloud service.