Hello HSNHnovelist. GoalieDad’s suggestions are similar to the process outlined in this Knowledge Base webpage and are one good way to keep sync data between your two computers.
We also have another Knowledge Base article, which takes the approach of storing your live, working project on a cloud-syncing service and working from that single project on both computers.
The approach you use will depend on how much you trust the cloud-syncing services. Whichever approach you use, making sure that Scrivener on both computers regularly creates its backups will help protect your work.
You might also find this post about backups by kewms helpful as you think about what your backup needs might be.