BKP)DEINIT()函数是将BKP外设寄存器复位到默认值，会不会把存放在BKP_DR1~DR10的数据一块清掉呢？

按照参考手册上的说明，应该是不影响：
Bit 16 BDRST: Backup domain software reset
Set and cleared by software.
0: Reset not activated
1: Resets the entire Backup domain
Note: The BKPSRAM is not affected by this reset, the only way of resetting the BKPSRAM is
through the Flash interface when a protection level change from level 1 to level 0 is
requested.
函数原型如下：
void BKP_DeInit(void)
{
  RCC_BackupResetCmd(ENABLE);
  RCC_BackupResetCmd(DISABLE);
}

void RCC_BackupResetCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  *(__IO uint32_t *) BDCR_BDRST_BB = (uint32_t)NewState;
}

#define BDCR_BDRST_BB             (PERIPH_BB_BASE + (BDCR_OFFSET * 32) + (BDRST_BitNumber * 4))

不会，这个只是关闭了BKP的功能。

试过了，对备份数据区有影响，会把备份数据清掉的