There are some default rules including size that decide the files that will be considered for the Continuous Data Protection operation. To minimize the impact of CDP on your normal PC functions at regular hours, the operation is executed only for files less than 500 MB. This usually covers most office and other documents that you work on during the day. The remaining files (in the Backup set) are considered during the normal Scheduled / Interactive backups. Temporary files, system files and mapped drives are excluded from the Continuous Data Protection operation.
In order to analyze the issue you are facing, we request you to send us the complete log files of IDrive application by using the 'Send Error Report' feature. You can find the 'Send Error Report' feature, by launching the IDrive application and click on the 'Username/email address' on the top-right and select 'Send error report'.