The primary principle of backing up your data is that any important data should exist in two or more physical locations at once.

备份数据的主要原则就是所有你认为重要的数据都有两份以上的物理备份。

youdao

Carpet backing (primary) -the base fabric on which pile yarns are tufted an anchored to make a carpet.

一级地毯底布：在底布上面铺上层层纱线，最后组成簇绒地毯。

youdao

At least the methods being promoted through the schemes for daily literacy and numeracy hours in England's primary schools have the backing of more convincing research than was available to Lady Plowden and her committee in 1967.

ECONOMIST: Journey up the learning curve

Bill Bradley, whom Mr Gore eviscerated in the primary election, bestowed his backing.

ECONOMIST: Al Gore��s unruly party

Cantor said he then gave money from his committee to the super PAC backing Kinziger in the primary.

WSJ: Committee investigating NY, Illinois congressmen