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If you pay for web hosting in order to run any kind of web-based application-from your WordPress blog to a nameplate site to a file-sharing service to a social media data archive-you need to back up your web server's data the same way you back up your computer's data. On database-driven web sites, there are two kinds of data you want to preserve and restore in case of disaster: the files that make up your site (the PHP/Perl/Python, JavaScript, CSS files, etc), and the contents of your database. Further, any good backup system should make both a local copy and a remote copy of the backed-up data.

In this day and age, it seems everything online has a price associated with it. Whether you're subscribing to a pay site for full articles or clicking on ads in a blog, everything online seems to have money associated with it. Luckily there is still a large, and very healthy, movement online for media files listed under the Creative Commons licenses.

There is no proverbial silver bullet to creating a safer city, but analytics technology is assisting law enforcement agencies all over the world to sort through information - part of the 2.5 quintillion bytes of data we create and consume every day - to get ahead of crime. Having access to all that information is an invaluable resource for law enforcement agencies, but it can also be pretty paralyzing. After all, only a fraction of the bits and bytes can actually be relevant, right? But how do you know and, more importantly, how do you find and act on it?

The American Journalism Review has just published a searing condemnation by Washington Post contributor Paul Farhi of the state of education journalism, much of which, it contends, reinforces a narrative that the U.S. school system is failing -- a narrative supported by "self-styled education reformers," but refuted by the experiences of many parents asked to rate their local schools. I've railed against this before in the context of tech blogs' treatment of education, and while the AJR piece doesn't address technology specifically, I would argue that the narratives of failing schools certainly fuel much of the growing business of ed-tech.

Ever since his grad student days at Hebrew University of Jerusalem, Amir Ronen, now a scientist at IBM Research -  Haifa, has been thinking about the intersection of game theory and computer science. In fact, he's one of the leaders in a sub-discipline, called algorithmic game theory, which lies at the intersection of the two fields.

In 1991, when I was a staff writer for Scientific American, I wrote a letter to Thomas Kuhn, then at MIT. I said I wanted to profile him for Scientific American and "tell readers how you developed your views of the process of science." When he didn't respond, I called. Kuhn was reluctant to do the interview. He distrusted journalists, and he was still peeved by an old Scientific American review of his 1962 book The Structure of Scientific Revolutions. When I persisted, Kuhn asked to see other profiles I had done, and I mailed him pieces on his MIT colleagues Claude Shannon and Noam Chomsky.

Robert Harvey asks: Occasionally I see questions about edge cases on Stack Overflow that are easily answered by the likes of Jon Skeet or Eric Lippert-experts who demonstrate a deep knowledge of a particular language and its many intricacies. Here's an example of this from Lippert's MSDN blog: You might think that in order to use a foreach loop, the collection you are iterating over must implement IEnumerable or IEnumerable. But as it turns out, that is not actually a requirement. What is required is that the type of the collection must have a public method called GetEnumerator, and that must return some type that has a public property getter called Current and a public method MoveNext that returns a bool. If the compiler can determine that all of those requirements are met then the code is generated to use those methods. Only if those requirements are not met do we check to see if the object implements IEnumerable or IEnumerable. This is cool stuff to know. I can understand why Eric knows this; he's on the compiler team, so it's explicitly in his job description to know. But how do mere mortals, those of us on the outside, find out about stuff like this?

Technology is a lovely thing, but sometimes it scares the bejeezus out of us. This working 3D-printed gun is one such case. Gun enthusiast "HaveBlue" has documented in a blog post (via the AR15 forums) the process of what appears to be the first test firing of a firearm made with a 3D printer.

Joey Hudy, a young "maker" from Phoenix went to the White House this week to show off his project, the "Extreme Marshmallow Cannon." When President Obama saw it, he told Joey: "Let's try it." Joey set up the air cannon, which uses a bicycle pump to build up air pressure, and put a marshmallow down the barrel. When he pressed the trigger, a single marshmallow was shot out across the room to the delight of everyone, but especially the president.

Several years ago, I read Brian Aldiss's Billion Year Spree -- his "true history of science fiction" from Mary Shelley to the early 1970s. I found Aldiss's account of the genre's development entertaining and informative... but something bothered me, long after I'd finished reading it. So much so that I've since spent hundreds of dollars on forgotten, out-of-print books; I've written dozens of long, scholarly posts about the thing that bothered me so much, for io9 and my own blog, HiLobrow; and this year I've even launched a money-losing publishing imprint in a quixotic effort to set the record straight.

In the past few years, digital technologies have revolutionized everything from the way we work to the way we educate, inform and entertain ourselves. In fact, millions of engaged citizens are using the Web to connect and collaborate around shared concerns and opportunities in their communities and in international forums and institutions. Now, as Canada readies itself to host the World Congress on Information Technology (WCIT2012) in Montreal this October, we have a unique opportunity to mobilize large numbers of connected citizens to participate in a global, online conversation designed to elicit new ideas and innovations that could help address some of the world's most urgent challenges.

For me, roller derby began with a very steep learning curve. I didn't know how to skate, I didn't know the rules, and so every practice left me physically and mentally exhausted. I did bring my own skill set to the sport: I've been an athlete my whole life, and played many a contact sport, and so some parts of roller derby - the physical fitness, hitting, body awareness, cross-training and nutrition - came easily.

"Salman Khan's dream college looks very different from the typical four-year institution. The founder of Khan Academy, a popular site that offers free online video lectures about a variety of subjects, lays out his thoughts on the future of education in his book, The One World School House: Education Reimagined, released last month. Though most of the work describes Mr. Khan's experiences with Khan Academy and his suggestions for changing elementary- and secondary-school systems, he does devote a few chapters to higher education."

The WikiMedia Foundation has added a new extension to MediaWiki, the foundation for Wikipedia, that adds geographic data for individual wiki articles. Aimed primarily at mobile users, GeoData will make finding information about your present location easy and fun. According to WikiMedia, GeoData aims to codify the common practice of adding geographic data to articles.

Heated political rhetoric is everywhere. It sets us apart from one another and erodes what's left of civil discourse. It grinds the worthy concept of "logic" into dust. Not any more. Not when we fight back with an open source game I'm calling Logic Shrink. I'm not selling a thing. You don't need an app, a console, even a board. It's entirely your game. Play a solitary version. Play it during a get-together with your extended family. Play it with kids, especially teens. Bring it to the classroom, community center, or secret Super PAC meeting. It will entertain. Afterwards, when the lively score-keeping has ended there will be something new in the room. It may be unfamiliar at first. It's a state of being that requires no name calling, no slippery slope. It's logical thinking.

Alpha One Labs co-founder Sean Auriti and a group of like-minded hackers have launched a campaign to build Hackert0wn, a Brooklyn hackerspace the likes of which the world has never seen. As planned, Hackert0wn will be an  entire hacker ecosystem complete with retail shops stocked with spare parts, sleeping pods, a gym that feeds power back into the building, a co-working space, private offices, a cafe with a coffee dispensing robot, a dumpling shop, an aquaponic farm that raises fish and produce for nearby residents and restaurants, and a state-of-the art CNC machine shop. Oh, and all the buildings will be built out of recycled shipping containers.

On Tuesday, a new company called Planetary Resources will announce its existence at the Charles Simonyi Space Gallery at The Museum of Flight in Seattle. It's not clear what the firm does, but its roster of backers incudes Google cofounders Larry Page and Eric Schmidt, filmmaker James Cameron, former Microsoftie (and space philanthropist) Charles Simonyi, and Ross frikkin' Perot.

n 1983, a Chinese fast-food restaurant in Pasadena, California hired a curious-looking pair of servers: two robots named Tanbo R-1 and Tanbo R-2. At 4.5 feet tall and 180 pounds, the robots would scoot around; bringing trays of chow mein, spareribs and fortune cookies to customers' tables.

As organizations like Code for America encourage government transparency and the concept of Open Data at multiple levels of government in the US, I think it's useful for us to take a look at how Open Data is handled in other countries. Given my non-existent skills in other languages and my distrust of Google Translate, I'll focus on English-speaking countries first.