Since Twitter search is utterly useless for finding tweets older than yesterday, I’m running the TwitterPad plugin to pull them into the doghouse and keep ’em safe and warm.
I am no longer using this plugin- see my twitter archive managed by Thinkup – http://thinkup.cogdogblog.com/
And that too changed. Thinkup has matured, but at the time it was using a lot of local resources, and I never looked at it. My current tool is the Sync Twitter Archive With Google Drive by Martin Hawksey now (until some future cross-out) at http://tweets.cogdogblog.com/, That Martin, he is a GENIUS!