I have a Seagate BUP Slim. I use Macrium to backup my Windows 10 laptop. I also run a file backup. I wanted to protect it with a password or encrypt it. Seagate says they don’t advocate anything, but you can use 3rd party software or Bitlocker
https://www.seagate.com/manuals/backupplus/frequently-asked-questions/
I don’t want to get new software. I have used Bitlocker – but I am concerned that it could render my backup useless, if it goes ‘bad.’ I would set it to open on this computer automatically (computer has a password – so I figure that is safe to do). But, if it gets fouled up and I need to access the data in case of a meltdown, it could be a problem. I don’t have any top secret info on my laptop – just personal data that you would not want criminals to have.
Have you protected your backup drive(s) and if so, how?