After a successful full back via ftp, I attempted to do a differencial back via ftp and recieved this message. Can anyone shed some light on why differential backup via ftp is not working? C0064006C: Incremental backup is not possible. The file you have chosen is not the Acronis True Image backup, or the file is corrupted, or this is not the last volume of multi-volume archive. Do you wish to proceed with the current file name? If you click OK, the chosen file will be overwritten and the full backup will be created. Otherwise, if you want to create an incremental backup, click Cancel and choose the valid archive file name or the last volume of multi-volume archive.