I know that if you disk fails in RAID5 i just need to replace, and let the controler do all the work.

What i was saying, if by any change, the 4 disk fail, of course i can't rebuild, if i have a full disk image, if i put the new 4 disk RAID5, will it work ?

But if the error on the drive is hardware, it should be ok to do a Clone Disk.