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That is also my understanding. A stopped SD! backup will leave the destination with some "new" files (ones copied before it is stopped) and some "old" files (those not yet processed before the backup is stopped). Depending on what is old and what is new, the system may work fine and just some of your data files will not be the most recent. But if it is interrupted in the middle of copying (for example) /System or /Library (or it has already copied one but not the other), then the OS may be in an inconsistent state.
An interrupted backup should be OK to use to grab individual data files, it is just not 100% safe to use it as a full restore. The filesystem itself will be OK, it is just the destination will not been a fully consistent "snapshot in time" of the source.
The next complete SD! backup will fix any inconsistency that may have been left behind.
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