答：When the file system format of hard drive and U disk is NTFS，it cann't backup.
答：When ACC is under flameout condition，power-off will automatically happen after it reaches the timing time of “power-off delay” setting.
答：When performing soft power-off and ACC is under ignition condition，power-on will automatically happen after power-off.。
答：Why power-off don't happen immediately after flameout？
The default of “power-off delay”setup in “system parameter” is 30 minutes，namely power-off will happen in 30 minutes after flameout；the default can be setted to 0 if wanting power-off immediately after flameout.
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