请再次检查，确保所有数据都已经备份。

Qǐng zàicì jiǎnchá, quèbǎo suǒyǒu shùjù dōu yǐjīng bèifèn.

Please check again to make sure all the data has been backed up.

请确保门已经关好。

Qǐng quèbǎo mén yǐjīng guān hǎo.

Please make sure the door is already closed.

请确保门窗都已经关好。

Qǐng quèbǎo ménchuāng dōu yǐjīng guān hǎo.

Please make sure all the doors and windows are closed.