Hi

Theoretically feasible, but only a software raid.
Performance is for shit. Better to use a housing with several hard disks, as the previous speaker said. Or directly a NAS.

Greetings

No, this is not possible with individual, external hard disks (as far as I know). Either buy a https://www.digitec.ch/de/s1/product/wd-mybook-duo-8000gb-externe-festplatte-3828584, an external hard drive enclosure (ICY Box or Drobo) or directly a NAS that supports RAID.

External hard drive enclosures (prefiltered by number of HDD slots): https://www.digitec.ch/de...
External backup solutions (pre-filtered, Drobo products): https://www.digitec.ch/de...
NAS (Unfiltered): https://www.digitec.ch/de...