Any operation that requires user interaction will fail if you are running the product in the silent mode
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Description
Acronis True Image Home 2010 can be set to run in the silent mode:
Backup Wizard -> Backup options -> Error handling -> Do not show messages and dialogs while processing (silent mode)

When running Acronis True Image Home 2010 in the silent mode, any operation that requires user interaction will fail.
Sample scenario
- You run the product in the silent mode and set it to back up a partition to a set of DVD discs;
- When the first DVD disc fills up, Acronis True Image Home 2010 will normally ask to insert a new disc. In the silent mode, however, the message will be suppressed, and the operation will fail.
It is recommended not to use the silent mode if you expect any sort of interaction Acronis True Image Home 2010 will require from you:
Backup Wizard -> Backup options -> Error handling -> Do not show messages and dialogs while processing (silent mode)

More information
To understand why exactly the operation failed, view the product's log (Tasks & Log).