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Dave, this has been a point of much discussion and conjecture.  I welcome other's opinions.

However, it seems that whenever Ghost 10 reaches some "threshold" of changes in the sectors of the partition that have changed, it will institute a base backup instead of what may be expected by the user as an incremental.

Remember that these are sector images not file backups.  So an active drive (like the c partiton) could easily only get a few incrementals, if that, and then a full base is always taken.

A different partition (mostly data files) would most likely get more incrementals before the full backup occurs.