noun
online backup
Computing term for backing up data to a remote server over the internet.
重要なファイルはオンラインバックアップを取っておいたほうがいい。
You should make an online backup of important files.
Variant with interpunct; less common but seen in some contexts.
General term for backup; オンラインバックアップ specifies that the backup is done via the internet.
Wasei-eigo (Japanese-made English) from 'online' + 'backup'.