documentation for why long incremental chains are bad

Bug #1031610 reported by az on 2012-08-01
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This bug affects 1 person
Affects Status Importance Assigned to Milestone
Duplicity
Undecided
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Bug Description

this is a forward of debian bug #677215, which lives over there: bugs.debian.org/677215

the original submitter had a 300+ long incremental chain, and was surprised badly that duplicity
ate all his space in /tmp on restore (see http://bugs.debian.org/676840 for history).

given my counter that long incremental chains are a bad idea, the submitter suggested that
the docs spell this out better - and i concur: the manpage says way too little about the
nature of incrementals, that they're deltas against previous inc's, or that long chains are neither
efficient to restore nor overly robust.

regards
az

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