I backed up carefully until I felt the wall against my back.

我小心翼翼地后退了几步，直到感觉到后背贴上了墙。

《柯林斯英汉双解大词典》

Had I backed up my applications, not just my personal data files, I could have recovered the data.

假如备份了我的应用程序，而不仅是我的私人数据文件，那么可能已经恢复了数据。

youdao

I backed up a foot and my attacker stopped attacking me.

我后退一步，攻击者停止了攻击。

youdao

I backed up a foot and my attacker stopped attacking me.

我后退一步，攻击者停止了攻击。

youdao