I have two HA systems running. I just setup the Google Drive backup integration and it works great. Are there any issues with using the same Google Project for a second system? The only thing I can think of is the naming of the backups, keeping them straight as it seems this integration only creates one folder in Google Drive called Home Assistant.
I’m in the same boat. I manage two different physical HA locations. Did you figure anything out? The easiest solution I found was to just use a different google account.
You can specify the folder/location in Google Drive, it’s under the settings: ‘Manually specify the backup folder’.
Edit: To clarify, this is on the Google Drive Backup settings in HA. I do exactly this with my two HA systems.