I use Outlook (full version with Office) and PST files. Theres other alternatives like Thunderbird (which is free), I haven't used them much though. I do it kinda like this, filter work email into Work.PST and personal email into Personal.PST. Then these files are included in backup, or sync to external drive. Every so often I date a copy of these files "20080202 Work.PST" and drop them on a archive DVD/CD. I do the same with my bookmarks/favorites docs photos, projects etc. This should be done every couple of weeks.