On April 26, ProofPoint, a cloud email archiving provider (among other solutions), published a short but interesting article; “Steps to avoid email archiving woes” talking about incomplete email archives.
I must say I agree with the article in general and especially with the point that the archive needs to be easy to search for in eDiscovery. With that thought I also wanted to add that for really effective eDiscovery of your email data, a complete archive is essential. What you want to avoid is being forced to go to backup tapes because some potentially responsive email might reside only on your backup tapes; a costly situation.
If you’re going to archive your email with eDiscovery in mind, be sure you choose a vendor that can captures everything that could be asked for in eDiscovery.