Capital One is an Amazon Web Services client, but the bank says it had few problems on Tuesday when thousands of other users of the cloud computing services experienced major disruptions to their websites and apps.

Amazon Web Services reported Tuesday high error rates with its service that companies use to manage web applications, house data and host software. Essentially, thousands of sites and apps rely on AWS and were not working or were rather slow that day.

But Capital One, which has fashioned itself as a bit of an evangelist for banks to embrace cloud computing, said its method of spreading its use of AWS across various regions was the key to its continuity.

Capital One has been somewhat of an evangelist for cloud computing for banks. Bloomberg News

“We experienced minor impacts that were quickly resolved due to resiliency we have in place across AWS regions,” a spokeswoman said in an email.

The AWS outage is a good reminder to banks that although cloud computing has considerable draws — better security and performance, for instance — it has the same disadvantage that so many bank systems have: the vulnerability of a relying on provider, said David Albertazzi, an analyst at Aite Group.

“Today’s event could potentially shake some financial institutions’ confidence in the public cloud as they’re contemplating what to put out there,” Albertazzi said in a statement. “They need to be selective in choosing which solutions they put on the public cloud versus private cloud. They also need to match requirements and inherent risks with the characteristics of each service and deployment models.”