Yes. “Backing up” is correct and widely used in American English, but it’s most accurate when it’s clearly tied to a specific context. The phrase can describe movement, support, or creating a copy of data, and the meaning depends on what you’re talking about.
In everyday speech, “backing up” commonly means moving backward. For example: “The driver is backing up the car.” It can also describe something becoming clogged or delayed, as in “Traffic is backing up” or “The sink is backing up.” In these cases, “backing up” is the natural, idiomatic choice.
“Backing up” can also mean supporting someone or confirming what they said: “Thanks for backing me up in the meeting.” Here, it implies reinforcement—offering evidence, agreement, or help when someone needs it.
In tech and office settings, “backing up” is standard for creating a safety copy of information: “I’m backing up my files to an external drive.” This use is correct whether you’re talking about photos, documents, or an entire device, and it’s often paired with where the copy is stored (cloud, hard drive, server, etc.).
Be careful with add-ons. “Backing up” works on its own, but “backing up on” can sound awkward unless you’re describing a pileup or overflow (“Cars were backing up on the highway”). For most support or confirmation meanings, “backing up” without “on” is cleaner: “I can back you up,” not “I can back up on you.”
For more examples and nuance across contexts, see the full guide here: https://zelvira.com/is-it-correct-to-say-backing-up/.
“Back up” is usually a verb phrase meaning to move backward, support someone, or make a copy of data. “Backup” is typically a noun or adjective, like “a backup plan” or “backup files.”
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