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Re-ocurring issue with keys on temp tables

We run a large forum with lots of reads and writes, particularly to the posts and topics tables which are both innodb. Last week I started doing 12 hourly backups with innobackupex because mysqldump ...
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Will deleting old MySQL data improve performance?

Would deleting old data from my tables improve MySQL query performance? When my queries use indexes? When my queries don't use indexes? When I use InnoDB? When I use MyISAM?