I have a question. I have Drive Backup Pro 9. I have a home computer and just want to use a second internal hard drive to backup my original hard drive in case of failure. I figure both drives probably won't fail simultaneously. The original drive has three partitions; a hidden Sony OEM partition with system restore, a C system drive and an E logical drive. I would like to synchronize the two discs monthly and be able to purge data since deleted from the source disc or at least not copy it again. I have read the entire help manual but am still confused about the best way to do this. Backup disc? Copy disc? Clone disc? And which of these allows "differential backup to file image" with ancillary file backups? How would I structure a combination of a backup image in conjunction with differential file backup? I greatly appreciate any feedback. Thank you very much!