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https://issues.apache.org/jira/browse/NUTCH-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Markus Jelsma updated NUTCH-1180:
---------------------------------

    Attachment: NUTCH-1180-1.5.-1.patch

Code was already there, only needed to conditionally not delete the old DB. 
Patch introduces a db.preserve.backup boolean directive which is enabled by 
default. 
                
> UpdateDB to backup previous CrawlDB
> -----------------------------------
>
>                 Key: NUTCH-1180
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1180
>             Project: Nutch
>          Issue Type: Improvement
>            Reporter: Markus Jelsma
>            Assignee: Markus Jelsma
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: NUTCH-1180-1.5.-1.patch
>
>
> Nutch currently replaces an existing CrawlDB with the new CrawlDB. By 
> optionally keeping a previous version on HDFS users can easily revert in case 
> of a mistake without relying on external backup mechanims.
> This should be enabled by default.

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