I believe this is what's known as a "differential" backup. Maybe that > could be a new command alongside "incremental". It seems to be a > standard feature of other backup utilities, so a good thing to put in > Duplicity as well. >
So at the end the "coalesce" - "condense" will do differential backup this just in a complicated way may be we should just call it differential and leave the user to execute it when he wants. Actually I like this I will definitely run every day incrementals and differential once a month it will be cheaper then a full backup but will break the incremental chain in more manageable pieces. And if one keeps the incrementals and the differential there will be 2 ways to restore the data if one peace gets damaged.
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