Storage device and recovery data backup method thereof

A method for backing up recovery data of a storage device comprising:

• determining at least one of a discharge time or a remaining time of an auxiliary power supply when a sudden power-off occurs;
• determining a minimum recovery data backup time, in case of a user data dump failure, using the determined at least one of the discharge time or the remaining time;
• and
• performing a data dump operation according to a defined dump level during the determined recovery data backup time.

A storage system comprising:

• a storage device including non-volatile memory and processing circuitry;
• and
• a host connected to the storage device through a host interface,
• wherein the storage device is configured to
• determine at least one of a discharge time or a remaining time of an auxiliary power supply when sudden power-off occurs,
• determine a minimum recovery data backup time, in case of a user data dump failure, using the determined at least one of the discharge time or the remaining time, and
• perform a data dump operation according to a defined dump level during the determined recovery data backup time.