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Why No True Verify Involving Comparison of each file on destination with source

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Acronis True Image Home 2010 appears to be a very good program, better than the old program I had been using. I understand that Acronis uses the parity bit to try to ensure the write process makes no errors as the files are being written. I also am aware of the Validate process.

Is this adequate? Older backup programs that I have used provided a separate verify step. This was carried out after all the files to be backed up had been written to their destination. This verification procedure involved comparing all files at the destination with the corresponding file at the source. The files on the destination which were different from the source were reported.

Have advances in backup technology made this step unnecessary? Do you get at least as much assurance of destination files matching the corresponding source file with the methods used by Acronis (parity bit checking, validation ... )?

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#1

Hello Robert,

I understand your anxiety clearly, I will help you get this explained.
First of all, please note that in spite of the fact that validation takes some time, it is strongly recommended to validate the archives. The Backup Archive Validation Wizard checks the compliance of the information that was read from the source drive with the information stored to the backup image. The validation process opens the archive files and reads them into RAM and the 4000 checksums/GB are recreated and compared to those included in the archive when it was created. If any one of the checksums does not compare perfectly, the archive is declared corrupt.
Actually, the validation doesn't provide you with the 100% guarantee that you will be able to recover the archive and to make the restored operating system bootable (there are a lot of factors that can bear it down, and the best test of this is to do an actual restore to a spare HD), but this operation reduces the probability of the malfunction exceedingly .
Please let me know if the provided information is not clear or if you have any other question. 

Thank you.

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#2

My ATI Home 2010 did not offer a validation when I backed up my hard drive 5-24-11. I prefer to validate but I could not find that option yesterday. I did mount and looked at some files and felt satisfied. I had to be satisfied because I could not validate. Is that normal with IE8 and windows 7?? I do not recall that ever happening before. I have been an ATI user since 2006 while updating to newer versions during the years.

Forgot to mention that I am registered and my present build is 7160 which is the latest build.

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#3

To validate an archive, click on recovery on the sidebar, select the archive to validate and click Validate on the toolbar.

Legend
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#4

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#5

Thank you Pat and Grover for your complete answers to my question. Too late for me to validate now because, as you know, the HDD contents have now changed. I do not recall the validation feature being "hidden" before(it seems it used to be under Tools. I have made a copy of your answers for future use.

Legend
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#6

Bu Yo,
Don't forget that validation can also be done immediately following the backup using the task backup options.

Yes, prior versions Rescue CD's had validation under the Tools section and very easy to find.

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#7

And thanks yet again GroverH. You have confirmed what I remembered and that was the validation feature was in Tools--and very easy to find. And, I would validate my backups immediately after creating the image. BTW, I like this forum; quick and easy to follow answers from you people.

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#8

Using a WDC My Book Essential, connected via USB 3, all attempts at validation fail at varying points; there is a message that the path has been lost. The backup appears to be OK, but it would be nice to validate once, even if it doesn't mean much. I've undone all the power-saving things that might interfere; the drive still seems to just disconnect. The WDC indicates no problem, just that it seems to have stopped responding to validation and reports the path to the backup is lost. It won't resume. Backups, no matter how large, have never done this...

Thanks, Bill

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#9

Can you validate from the recovery CD?

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#10
Bu Yo wrote:

Thank you Pat and Grover for your complete answers to my question. Too late for me to validate now because, as you know, the HDD contents have now changed. I do not recall the validation feature being "hidden" before(it seems it used to be under Tools. I have made a copy of your answers for future use.

The validation is totally independent of the HDD contents. Like Oleg said, it computes the checksum for each 256K byte block in the archive and compares it to the one stored in the archive when it was created. An archive can be validated at anytime and even on a different machine.

Doing a file-compare or what is sometimes called a bit-for-bit validation is impossible when doing live imaging within Windows since the disk is changing even as the archive is being written.