What do you mean by "gone as far as to cover up their tracks"? That's attributing motivation, which is the entire discussion at hand; what action are you referring to?
If you mean that she used a private email server, remember that Hillary Clinton was the first secretary of state to live in the era where real-time email was a thing the average (American, at least) person had. iPhone and Android both came out in 2007; Hillary became Secretary of State in 2009. We have no information was to whether Condoleezza Rice would have wanted to, say, use the Dropbox mobile app had her job continued past 2009; that app didn't exist during her tenure. No one in the history of the US government had gone as far as to use reliable email on their mobile device to get their job done, but that's because Hillary happened to be Secretary of State during the years when real-time email in your pocket became practical.
Eh.... The extent that Chicago's mayor's office has gone to prevent me from getting their phone records comes pretty damn close.. I seriously, seriously doubt there are only a few situations like these.
If you mean that she used a private email server, remember that Hillary Clinton was the first secretary of state to live in the era where real-time email was a thing the average (American, at least) person had. iPhone and Android both came out in 2007; Hillary became Secretary of State in 2009. We have no information was to whether Condoleezza Rice would have wanted to, say, use the Dropbox mobile app had her job continued past 2009; that app didn't exist during her tenure. No one in the history of the US government had gone as far as to use reliable email on their mobile device to get their job done, but that's because Hillary happened to be Secretary of State during the years when real-time email in your pocket became practical.