Random backup failure with VSS

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#1

For some reason, Duplicacy is randomly showing “Shadow copy creation failed”. I have my backup set for every two hours and it seems that it fails once, then the next time it is successful. I’ve been unable to determine why it’s so random. Below is a snippet of the log:

Back up C:/@localhost to storage OneDrive, status: Failed, log file: backup-20210729-210002.log
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Running backup command from C:\ProgramData/.duplicacy-web/repositories/localhost/0 to back up C:/
Options: [-log backup -storage OneDrive -threads 4 -vss -stats]
2021-07-29 21:00:04.103 INFO REPOSITORY_SET Repository set to C:/
2021-07-29 21:00:04.112 INFO STORAGE_SET Storage set to odb://Duplicacy/Jadon
2021-07-29 21:00:18.745 INFO BACKUP_START Last backup at revision 39 found
2021-07-29 21:00:18.748 INFO VSS_CREATE Creating a shadow copy for C:\
2021-07-29 21:00:20.611 ERROR VSS_START Shadow copy creation failed: StartSnapshotSet returned 80042316
Shadow copy creation failed: StartSnapshotSet returned 80042316
#2

This is possibly because you have other backup jobs creating shadow copies at the same time? i.e.:

#3

Good to know. I’ll check into that.

#4

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