-Keep every e-mail.
Keep your own backups of critical information (emails, files, notes, whatever), personal or project, in particular of your personal HR information.
Don't violate security policies doing this (i.e. Cloud services like Dropbox may not be acceptable for sensitive or classified information), but DVD-R / BD-R and USB flash drives make this cheap enough to do as an out-of-pocket expense if necessary.
Spend time organizing or keeping your information organized. Having lots of data / information "on one of these old hard drives" isn't helpful.
RAID is not a back-up strategy.