I've long been looking for a way to write protect one USB drive, while backing it up to another USB drive. And also to be able to mount USB drives as read-only to be confident of their contents remaining safe.
I've in the past wondered about using a forensic write blocker but they are expensive and I've always wondered if they're overkill. All I really want is the USB inline equivalent of a write protection switch. I just noticed there are cheap USB inline adapters like this one that purport to write block. Would it be OK to use one of these to write protect a drive I'm trying to back up?