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Not able to do incremental

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I have Acronis 2010. I did a full backup last August and now wanted to do an incremental backup. When I selected the backup archive I was given the message that it was not an Acronis backup or is corrupt.

When I did the original backup, I also performed the check archive right after backing up. Why would Acronis now say the backup is no good? I've gotten this message before and I had to perform another full backup. Who knows, if I need to reference it down the road, I will get the same message. That scares me so I need to find out why this is occuring.

Also, I performed an image backup but did not try the incremental backup as it seemed to inform me it would overwrite the image archive. Is it safe to do incremental on a full image backup. Does it overwrite it? Should I be afraid of doing this?

More importantly is the above corrupt/not Acronis message. The full backup was performed on an extenal hard drive which checks out fine (no bad spots, ran chkdsk).
I am very concerned because I needed an earlier backup to resore from a OS reload and got this same corrupt message at that time also. So I have had this happen before.

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ATI displays that message if it cannot properly read the archive. While corruption is one possible cause, the error could be caused by a less-than-ideal connection to the external drive, or drive errors.

Run chkdsk /r on that drive. Also run a drive checking utility from the drive manufacturer, as those sometimes catch errors missed by chkdsk.

Don't connect via a hub, a port in a monitor, a USB extension cord, etc. Connect the external drive directly to a USB port on the rear of the computer case. See if that works better.