The previous boost module had the possibility to delete cache files only if they changed "

[ ] Check database timestamps for any site changes. Only if there's been a change will boost flush the expired content on cron. (this helps to reduce server load by keeping cached pages that have not changed)

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In the new version I don't find this possibillity to change this. How boost is manage files that does't change?

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Anonymous (not verified) commented

Boost deletes old files on a cron job once their cache time has expired. The "crawler" is not correctly named in that it regenerates pages and family of pages (in combination with the expire module) if a page has been updated, inserted or deleted.

The recommended setting is to delete the pages using cron, personally I don't agree with that unless style revisions have happened on the site, instead I keep a full cache and let anonymous users generate it.