Operating method of memory system and memory system

An operating method of a memory system including a plurality of logical address groups each having a preset logical address range, the operation method comprising:

• selecting a victim block;
• selecting a target block into which valid data stored in the victim block is to be backed up, among empty blocks;
• deciding a backup order of the logical address groups, the backup order indicating an order that valid data corresponding to the respective logical address groups are backed up into the target block;
• and
• backing up valid data selected from the valid data based on the backup order, into the target block.

A memory system comprising:

• a plurality of nonvolatile memory devices each including a plurality of memory blocks represented by a plurality of logical address groups each having a preset logical address range;
• and
• a controller configured to group the memory blocks into a plurality of super blocks across the nonvolatile memory devices, select a victim super block among the super blocks, and control an internal backup operation for the victim super block,
• wherein the controller further determines logical address groups including logical addresses of valid data stored in the victim super block among the logical address groups, and backs up the valid data into positions mapped to the determined logical address groups.