When I tried to save my file, the error message ‘version backup failed’ showed up. But after I closed this file and reopened it, my last modifications are still there. Does it mean it, despite that error message, my file was saved properly? Or should I be worried that there is still data loss possible? Thanks!
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Look in the same directory where your .blend file is. Is there a .blend1 and a .blend2 there? An inability to write those files (perhaps permissions) may be the cause for that error.