The two NASA astronauts tasked with replacing a malfunctioned backup computer at the International Space Station (ISS) completed their task seamlessly.

According to the Associated Press, Rick Mastracchio and Steve Swanson performed the spacewalk Tuesday in less than an hour. After replacing the dead computer, the new one tested fine and their mission was complete.

The ISS crewmembers were never in any danger due to the malfunctioning backup because the main one ran fine. Since the backup failed two weeks ago, mission managers wanted to schedule a spacewalk ASAP to replace it to guard against what would be a catastrophe if the main one died as well.

The ISS was not willing to wait for the recent resupply mission from SpaceX, which arrived Sunday with food, experiment equipment and other cargo. The Dragon spacecraft's launch had been delayed more than a month due to a series of glitches with the rocket and ground control.

NASA had put equipment needed for the spacewalk on board, but the ISS crew was ready to proceed with the repair if SpaceX needed to make one last delay. The Friday launch was threatened by bad weather, but it took off anyway and successfully delivered the cargo Sunday.

Also on board the Dragon capsule were two legs for Robonaut, a humanoid robot that is expected to one day help around the ISS with daily housekeeping tasks. Robonaut will allow ISS crewmembers to focus more on scientific experiments and other more important tasks.

Before the spacewalk, Reuters reported, former ISS crewmember Chris Cassidy said on NASA TV the spacewalk was not expected to be complicated.

"We anticipate it to go quickly, but as with anything in space operations... you never know what's going to be thrown at you," he said.

"Looks like we've got a new MDM," Mastracchio said after inserting the new backup computer, Space.com noted.

After the new one was tested, the ISS veteran remarked, "oh wonderful."

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