Interesting points from a e-legal blog
Point 1: The expanding digital universe will exceed 35 zettabytes by 2020, IDC
predicts.
In 2009, global digital data topped 800,000 petabytes and was projected to reach 1.2 million petabytes in 2010. Storing 1 million petabytes on DVD would generate a stack of discs that reaches the moon and back. However, that rate of growth—62% in one year—pales compared with IDC’s prediction that the figure will top 35 zettabytes (36.7 million petabytes) by 2020, or 44 times as much as 2009. That stack of DVDs would reach halfway to
Mars.
(following graphic originally posted by Tech News Ninja here)

Point 3: Social media represents significant ediscovery challenges:
The
SCA is a formidable obstacle for parties looking to collect data from a
social network. Often the only option is to seek voluntary waiver by the person of interest. Needless to say, more often that not any request to collect and analyze this type of data will need to be targeted and precise so as to avoid privacy concerns and other rights. If the information is available on a public-facing portal of a social network then the collection may be easier to accomplish though the ability to do a targeted collection is somewhat limited by the user interface and/or local
API. Further it is difficult to think of this dynamic and changing data as a “document” under traditional ediscovery practices and so reviewing and analyzing presents unique challenges.
Point 4:
Data Governance is becoming a stronger practice and discipline – it is also on the rise:
(graphic created by DAMA.org)
Conclusion: Data – how we use it, how we access it, where we create it – is changing. All of this leads to more and more data from more and more sources. The MDM/Data Governance movement is seeking to organize data inside organizations and seeks to make information (which is what data contains and transports) more accessible. So while the universe of data grows so does the ability to seek and capture only the relevant or useful information (See graph below for a non-scientific illustration.) So proportionality could eventually be “built into” our ediscovery methods and practices – it simply will not be feasible any other way.