Did other Secretaries of State create their own e-mail servers to get around record retention and disclosure laws? I don't think so.
If you are talking "motivation", then can you prove that her intention was to "get around record retention and disclosure laws"? I don't think you can, because her intention was convenience.
Hillary Clinton destroyed government property by deleting and not turning over work-related e-mails asked for in the investigation. The IG basically confrims this. And if Hillary Clinton's intention was "convenience", why is there an e-mail of Clinton saying that she used the server so that "personal" e-mails (as defined by her) wouldn't get retained by the government.
Sorry. Most employees are perfectly capable of maintaing separate e-mail accounts for work and personal matters. It's not rocket science.