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Hacker Shuts Down Copenhagen's Public City Bikes System (bleepingcomputer.com)
An anonymous reader writes: "An unidentified hacker has breached Bycyklen -- Copenhagen's city bikes network -- and deleted the organization's entire database, disabling the public's access to bicycles over the weekend," reports Bleeping Computer. "The hack took place on the night between Friday, May 4, and Saturday, May 5, the organization said on its website. Bycyklen described the hack as "rather primitive," alluding it may have been carried out "by a person with a great deal of knowledge of its IT infrastructure." Almost 2,000 bikes were affected, and the company's employees have been working for days, searching for bikes docked across the city and installing a manual update to restore functionality. The company is holding a "treasure hunt," asking users to hunt down and identify non-functional bikes.
Doesn't seem like they lost anything, the way you're describing it. Here's the initial announcement, and here's the update. Doesn't;'t seem like they lost anything in their database.
What seems to have happened is that the hack has managed to erase the client side. Either poison data/commands has erased the tablet they attach to the bike, or the tablet still has data but is now out of sync with their restored backup. That will be why they're talking about going round rebooting the tablets on the bikes - it's the client side that's wrong, ZFS-nothing - it simply wouldn't have helped.