You don't want to stripe, if one goes you'll lose both, doubling your chance of failure. Mirror with 2 disks or RAID5 with three disks is good for backups, both options have 1 disk of redundancy with RAID5 giving a performance increase. Raid0 is only for going fast and for anything you don't want to keep.
If your data is really important, get a docking station for a HDD and back up onto a 2TB drive and then unplug it and put it in your safe. Raid is good if a disk dies but if you get a virus or accidentally delete something you're still screwed. Having the drive unplugged also protects you from stuff like power surges, theft and system malfunction.