I use BackInTime (which is basically a front end for rsync) for backups, and I run one every night at 1 AM. This is on Linux Mint Cinnamon. If the computer is locked/the monitors have gone to sleep (computer isn’t suspended), when the backup begins the monitors turn on, and will then stay on all night. I don’t want to waste the power or wear out my backlights.

How can I stop it from turning the monitors on, or how can I get it to turn them back off?