"The company, which hosts 1.7m sites in the UK, said an error made during maintenance "effectively deleted" what was on some of its servers.
"We can conclude that the issues faced have resulted in some data loss for some customers," the firm admitted.
It started a "recovery process", but advised customers with their own data backup to rebuild their own websites."
"All of this led Estonia to two inevitable conclusions. The first was that residency didn't have to have anything to do with geography. And so in 2014, e-residency was born."
"No matter how much our computers assure us they're backing everything up to a hard drive in the sky, memory failure remains a hardwired part of our lives. Writers reflect on when a digital loss created an emotional hole - from the college essay that disappeared minutes before the due date to an iPhone update that lost years of photographs."
"It's been a year since the music links on Myspace stopped working; at first the company insisted that they were working on it, but now they've admitted that all those files are lost: "As a result of a server migration project, any photos, videos, and audio files you uploaded more than three years ago may no longer be available on or from Myspace. We apologize for the inconvenience and suggest that you retain your back up copies."