First of all welcome to the community forum and sorry it had to be under these circumstances
May I ask what made you determine that it failed? What did you expect and didn’t happen? Any error messages?
So usually it works when going to the settings > backup & restore > restore
If you have done a backup on another device via the downloaded “Memex Backup Helper”, there should now be a folder on your system called “backup” in the folder you selected.
This “backup” folder needs to be copied over to the new compute. When clicking on “Restore”, you need to pick the parent folder of the “backup” folder. I know its not really intuitive, we have an overhaul of the backup/restore workflow already on the map.
Once the restore is done, you start the “backup wizard” which should be the first item in the backup&restore settings page.
Once you have set this up it would just continue adding to the same folder as before, so your new extension is as if it was the old one.
Hope that helps!