Hi Raghavendra,

Welcome to QuickBooks Community.

The security of your data is our first priority. That's why QuickBooks Online automatically backs your data up with the same level of security used by banks and financial institutions. You don't need to worry about saving your QuickBooks data on a flash drive because we’ve invested a great deal of thought and resources into ensuring a completely reliable system.

How do we keep your data safe and secure?

• Whenever there are changes to your company file, your data is saved to two hard drives.
• We periodically copy all data to a third-party hard drive in order to protect your data in case something happens to the first two hard drives.
• Automatic backups are performed every night.

I hope this helps.