A cyclic backup method for a solid-state disk (SSD) device includes writing, by a controller, data into corresponding physical address and reading data from corresponding physical address according to logic address of a first mapping table; receiving, by the controller, a backup signal; writing, by the controller, data into corresponding physical address and reading data from corresponding physical address according to logic address of a second mapping table; reading, by the controller, a first data according to logic address of the first mapping table when the controller cannot read the first data according to logic address of the second mapping table; receiving, by the controller, a recovery signal; and reading, by the controller, data from corresponding physical address according to logic address of the first mapping table.