Hello,
When using AOFO, check the Option Automatically Select Open File Technology.
Install this Microsoft Hotfix.
Time-out errors occur in Volume Shadow Copy service writers, and shadow copies are lost during backup and during times when there are high levels of input/output
http://support.microsoft.com/default.aspx?scid=kb;en-us;826936
Apart from that, if you are using AOFO only to Backup Shadow Copy Components, we recommend that you leave the Advanced Open File Option blank. Do not select anything over there as by default, for backing up Shadow Copy Components the Microsoft Volume Shadow Copy Service will be used anyways.
Hope this helps.
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