Cloud apps can be a godsend — until they stop working, taking all your data with them. Google Docs users worldwide have learned this the hard way this week, locked out of their documents by a bug which Google says is currently its #1 priority to fix, but hasn’t been able to resolve for six days and counting. The bug, associated with Google’s new multiple account login feature, causes an endless redirect when people try to open a document. Microsoft has been quick to jump on the opportunity to promote its forthcoming Office 365 service, which caches files locally, as a better solution than the all-cloud solution Google is offering. Google has been apologetic about the bug but says since it is not actually an outage it will not honor its 99.9% uptime guarantee for Google Apps Premier users.