Livedrive Backup runs on a scheduled scan of the files you have selected to back up.
You can however force a scan of your files as follows:
1. Click on the Livedrive icon
2. Select Status
3. Click on Scan Now under the Backup section or click on Detailed Status and press on the Scan Now button
Livedrive will then scan all your backed up files for any changes. Any changes detected during the scan will be uploaded and saved as another version of the file in your web portal.