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This seems to be the key to reproducing the issue. I close Parallels nightly before my backup runs and start it up again in the morning. I have automated closing and opening of Parallels wit cron and a few shell/applescripts ("tell application Parallels to quit", "open /path/to/VM.pvs", etc). There's typically about 10 hours of inactivity where about 6 of those Parallels is closed.Everything works fine unless the system sits idle for several hours.