How to keep a "My Passport" Drive unlocked

I expect this has been asked multiple times but, after entering ones unlock password, how does one stop ones “My Passport” USB drive from going offline during a backup? It can be half-way through but, if nothing else is running, Windows 10 goes to sleep and the backup quietly fails.

Hello,
Please refer to the following KBA: https://support-en.wd.com/app/answers/detail/a_id/20555/

Many thanks but you have answered a completely different question, which I didn’t ask.