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Google Drive users have reacted angrily to a glitch leaving some unable to access files from the last six months.
Google said it was investigating the issue which is affecting some users of its hugely popular cloud storage service.
Users reacted angrily on Google's support site, with one calling it "very devastating", adding "the files are very important to me".
Enza Ianopollo, a data privacy expert at analyst firm Forrester, said the situation was a "big deal" for Google.
Ms Ianopollo said business customers in particular would need to know exactly when and if their files had been accessed or altered - because it would be them rather than Google who would be liable for any data loss.
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