How to export a vault's items to a file while logged on the 1Password web access to a vault

relative's iMac and while I have him using 1P v8 I am concerned with him making mistakes and maybe deleting items or changing information like passwords, etc on items. I was thinking of doing a quarterly or more often complete backup of his 1P vault and saving in Backblaze for when-needed recovery.
Since I can't do that via Safari currently, I'll do it via remote desktop access and do it when I access to assist him on other issues but the cognitive problems that are worsening are also effecting the relative's ability to do their end's connection tasks. Will look into Apple Remote Desktop to see if it can work without the remote user getting involved.
Thanks
Larry