Can I use Parachute Backup with multiple Photos libraries?

On Mac

Parachute Backup works with the System Photo Library, the library your Mac uses for iCloud Photos. Apple only lets apps read that one library, so other libraries on your Mac are not included in your backup.

To save a different library, make it the System Photo Library in the Photos app under Settings > General > Use as System Photo Library. Choose a separate destination for each library, so the backups of the two libraries stay apart.