To back up non-WordPress folders:
Step 1: Go to BlogVault website and sign up using your email ID.
Step 2: On the BlogVault site listing page, select the website of your choice.
Step 3: Click on the Details button present in the Backup module, you will see the total files that were scanned. Click on "View All".
Step 4: In the next page, scroll down to the folders that are marked in red by BlogVault while scanning.
Step 6: BlogVault will tell you about why the folder is being ignored. Click on OK.
Step 7: Click Add.
Step 8: That’s how you add/download a non-WP folder so that BlogVault scans it too.
Read more: How do I pause backups?