BSYR884E Invalid value. Backup method must be (B)cv, (S)nap, (F)lash, or dfsmsdss(L).

Explanation
The value that you specified for Backup Method is not valid. Valid values are (B)cv, (S)nap, (F)lash, or dfsmsdss(L).

User response
Specify a valid value: B, S, F, or L.