Hello, sorry for my bad English. I hope you understand my question. My TI 10 Build is 4940. I have set a daily task for HD 1 with differential backups to my backup-folder on HD 2 (I do not use Secure Zone). The folder is limited to 21 Images (3 weeks) and a max. size of 50 GB. Always when the limit is reached, the backup runs up to 99 % in a few minutes and then it works and works about 30 minutes or more, only to delete one of the older Images. Why does this need such a long time?