When performing a snapshot backup a failed validation error is reported for some or all Databases.
1:12:31.872 AM: [22312.7312] <2> exchange_shadowcopy_access::V_Read_FI_File(): ERR - ReadFile(\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy145\mailbox1\mailbox.edb<file:///\\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy145\mailbox1\mailbox1.edb>) failed (error = 21), size = 16384, size read = 0, remaining size = 77431836434
1:12:31.904 AM: [22312.7312] <2> tar_base::V_vTarMsgW: ERR - failure reading file: Microsoft Information Store:\mailbox1\Database (BEDS 0x0: )
Increase the VSS quota size under properties for the drive and the Shadow Copies tab. Highlight the drive, select settings and either set it to "No limit" or increase the size to a number that will be sufficient for the backup.
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