Sorry to hear you’ve been having this problem. I just advised another poster on backups and saving in the (extremely lengthy) post below. Skip the parts having to do with syncing:
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One thing to be clear on: In Windows Scrivener, the option ‘Backup with each manual save’ will only make a backup when you press Ctl-S to do a manual save. With this setting, you can consider Ctl-S as similar to what you would do in MS Office, and save frequently, due to your temperamental PC. You’ll end up with a lot of zipped backups. A zipped backup in Scrivener is a copy/snapshot of your entire project, and is what you’ll want to restore from when a Windows crash botches your project. You’ll want to change the setting “Number of backups to retain” to something high, best case being that you change it to Keep All, and delete them yourself after a writing session.
Best of luck,
Jim