Seagate has bought back-up company Mirra for an undisclosed amount.

Mirra develops hardware and software for PC users to back up data and access it from anywhere through the Internet. All its 34 employees will become Seagate employees and Mirra will operate as a wholly owned subsidiary.

Mirra's Personal Server product is designed to automatically save documents and media files to an external hard drive when users save those files to their hard drives. An 80GB version costs $249; a 160GB version costs $399, and higher capacity versions are also available.

Seagate is the world leader in hard drives and makes them for PCs, servers and consumer electronics devices. The company said it would blend Mirra's software and services with its own line-up of hard drives and external storage products. It has yet to decide how future products will be branded, the spokesman said.