Does a dual-camera video take up iCloud storage?
Short answer: not right away. A dual-camera recording is written to the app’s own library the moment you stop filming, and nothing in that library is backed up to iCloud on its own. iCloud only sees the video once you deliberately save it to Photos — the same library the built-in Camera app uses — and even then, whether it actually uploads depends on a setting that has nothing to do with the camera app: whether iCloud Photos is turned on for your account.
The two questions people actually mean when they ask this — “is my footage silently eating my iCloud plan” and “how much space will this actually cost me” — have different answers, and both are worth answering properly rather than guessing.
Two different storage accounts, not one
A dual-camera recording lives in two possible places, and they are not the same account. The app’s own library, where every take lands the instant you stop recording, is local storage on your phone — nothing about it involves iCloud, because nothing about it involves the internet. Photos, by contrast, is the library the system camera writes to directly, and it is the one iCloud Photos actually watches.
DualCam keeps a recording in its own library first and moves it nowhere else until you decide to, so an afternoon of dual-camera takes you have not saved yet costs you local disk space and nothing more. iCloud has not seen any of it.
What changes the moment you tap Save
Save copies the file into Photos. From that point on, the video is an ordinary video as far as iOS is concerned — it does not know or care that it came from a dual-camera app. What happens next depends entirely on whether iCloud Photos is switched on for your Apple ID. If it is, the video queues to upload the same way any photo or video you take does, usually over Wi-Fi in the background. If it is not, saving to Photos only ever touches local storage, and iCloud is not involved at any point.
This is worth knowing because it means the app itself has no iCloud switch to flip. Whatever your account already does with new photos and videos, it will do with a saved dual-camera clip too, because by the time iCloud is involved, it is no longer looking at a dual-camera file — it is looking at a video like any other.
How big the file actually is
The number that matters for a storage budget is the finished file, not the two camera feeds that went into it. DualCam encodes the composited video at roughly 10 Mbps, which works out to about 75 MB per minute, a little over 4 GB for an hour. That is the size of the one file that gets saved — running two cameras at once does not double it, because the output is a single composited video, not two video files stitched together.
Put next to a typical single-camera 1080p video shot on the same phone, that per-minute cost is in the same range, not twice it. The part that actually catches people out is not the rate, it is the habit: a dual-camera app tends to get used for longer, more frequent takes — a whole walking vlog or an hour of a study session — precisely because it is built for exactly that, and an hour of anything at a few gigabytes adds up against a free iCloud plan faster than a handful of ten-second clips ever would.
Keeping it from creeping up on you
Because a dual-camera recording sits in the app’s own library before it ever reaches Photos, you get a review step that a normal camera does not give you. Scrub through a take in DualCam’s built-in library and decide whether it earned a save before it touches Photos at all — a take that ended early because the phone got hot, or one you simply do not want, costs nothing in iCloud if it never leaves the app.
Lowering resolution does not help here the way it might seem to. DualCam’s capture setting changes how much detail is drawn into the frame, not the size of the canvas it writes, so 720p and 1080p take up close to the same space on disk and in iCloud. The lever that actually matters is which takes you save, not which resolution you shot them at.
If iCloud Photos is on and space is genuinely tight, the fix is the same one that applies to any video: Apple’s Optimize iPhone Storage setting keeps a smaller version on the phone while the full file stays in the cloud, and it is a Photos-level setting, not something a dual-camera app has any control over.
Common follow-up questions
Does recording with DualCam use iCloud storage while I am filming?
No. A recording stays in the app’s own library, which is local storage, until you save it to Photos. iCloud is not involved until that point.
Does saving a dual-camera video turn on iCloud backup for it?
No — the app has no iCloud setting of its own. A saved clip is backed up if iCloud Photos is already turned on for your account, the same as any other video you take.
Is a dual-camera video bigger than a normal video, so it costs more iCloud space?
Not really. It is one composited file at roughly 75 MB a minute, in the same range as a single 1080p video, not double, because recording two cameras at once still produces one output file.
Want to just do this?
DualCam records the iPhone front and back cameras at the same time and writes one finished MP4 while you shoot. Free, no account, no ads, nothing leaves the phone.