CRC test failed

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fullbore
Posts: 71
Joined: Tue Sep 27, 2011 9:53 pm

CRC test failed

Post by fullbore »

Got the following logged on a differential backup last night-

[16/07/2026 23:04:42] Warning: CRC test failed for file "C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\Updates\308046B0AF4A39CB\backgroundupdate.moz_log". CRC stored in catalog is 0, destination CRC is 946D680D
[16/07/2026 23:04:56] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Microsoft\Windows\WebCache\V01.log". CRC stored in catalog is 0, destination CRC is 923FBB6D
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\8439". CRC stored in catalog is 0, destination CRC is 53AF1BBE
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\8439". CRC stored in catalog is 0, destination CRC is 53AF1BBE
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\8439". CRC stored in catalog is 0, destination CRC is 53AF1BBE
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\8439". CRC stored in catalog is 0, destination CRC is 53AF1BBE
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\8439". CRC stored in catalog is 0, destination CRC is 53AF1BBE
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\27135". CRC stored in catalog is 0, destination CRC is 65782D21
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\27135". CRC stored in catalog is 0, destination CRC is 65782D21
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\27135". CRC stored in catalog is 0, destination CRC is 65782D21
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\27135". CRC stored in catalog is 0, destination CRC is 65782D21
[16/07/2026 23:04:57] Warning: CRC test failed for file "C:\Users\Holtain\AppData\Local\Mozilla\Firefox\Profiles\l20cocwa.default\cache2\doomed\27135". CRC stored in catalog is 0, destination CRC is 65782D21
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Adrian (Softland)
Posts: 1992
Joined: Wed Dec 16, 2009 12:46 pm

Re: CRC test failed

Post by Adrian (Softland) »

Hi,

It seems that during the backup, the file size information could not be read correctly so it was marked with zero. Please run again the backup and let us know if the warnings appear again for the same files.
Do you know you can monitor your backups remotely with Backup4all Monitor? You can read more here: https://www.backup4all.com/backup4all-monitor.html
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fullbore
Posts: 71
Joined: Tue Sep 27, 2011 9:53 pm

Re: CRC test failed

Post by fullbore »

No further warnings on later nightly differential backups.

There was one for a different file-

Warning: CRC test failed for file "C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\Updates\308046B0AF4A39CB\backgroundupdate.moz_log". CRC stored in catalog is 0, destination CRC is 76B51FC3
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Adrian (Softland)
Posts: 1992
Joined: Wed Dec 16, 2009 12:46 pm

Re: CRC test failed

Post by Adrian (Softland) »

Hi,

It's possible that file was locked during the backup execution.
Do you know you can monitor your backups remotely with Backup4all Monitor? You can read more here: https://www.backup4all.com/backup4all-monitor.html
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