Which Cloud Storage Uses the Least Local Disk Space? Dropbox vs Google Drive vs iCloud vs OneDrive vs pCloud

Short answer: if your goal is to keep hundreds of gigabytes or several terabytes of photos, videos and archives in the cloud without permanently mirroring the entire library onto your laptop, all five services can reduce local disk usage — but they do it differently. Dropbox uses Online-only files, Google Drive uses Stream files, OneDrive uses Files On-Demand, and iCloud relies more heavily on macOS optimisation decisions. pCloud takes a more storage-first approach: pCloud Drive is a virtual drive by default, while local Sync is a separate feature you choose only when you actually want a mirrored copy.

That does not mean pCloud uses zero local storage. Opened and transferred files can use cache, and large copy-and-paste uploads into pCloud Drive can temporarily consume disk space. The useful difference is that pCloud exposes the virtual-drive-versus-sync decision clearly, lets you control cache behaviour, and now offers a separate Uploads workflow for large one-way transfers that does not rely on local disk caching.

If you have a 256 GB or 512 GB laptop but a 1–5 TB media library, that distinction is not cosmetic. It determines whether your cloud service feels like an extension of your disk or like another folder you constantly have to dehydrate, optimise and clean.

First: stop asking which service uses “zero” disk space

No desktop cloud-storage system should be evaluated with a zero-byte mental model.

Even when a file is cloud-only, the desktop client may still keep metadata, placeholders, thumbnails, indexes or cached content. Opening a cloud-only file can download it. Editing a large video may require a substantial local working copy. Uploading a large batch may need staging space. Some applications do not behave well with streamed files at all.

The useful question is narrower:

Can the service keep the bulk of my archive cloud-primary while giving me predictable control over what becomes local?

For a large photo/video archive, that is the real decision.

The Big 4 + pCloud: the local-disk model in one table

The first important conclusion is that Dropbox, Google Drive and OneDrive are already good at cloud-only storage. If someone tells you pCloud is the only service that can save SSD space, that comparison is too shallow.

The second conclusion is more useful: the services differ in how much of the behaviour is explicitly under your control, and whether the cloud-first model is the core product or an optimisation layer around an ecosystem.

Dropbox: Online-only works well, but opening files changes their local state

Dropbox's Online-only mode is straightforward. The file remains visible in Finder or File Explorer as a placeholder, and Dropbox says the online-only file itself does not occupy normal local storage. Open it, however, and Dropbox downloads the file so applications can use it.

For a large archive this is generally a good model. You can keep old project folders online-only, make current projects available offline, and use selective sync to remove entire folders from the local Dropbox view.

The friction appears when your archive and your active working set overlap heavily. If you repeatedly open RAW photos, video projects or large media files, the machine can gradually accumulate more local data than you expected. Dropbox gives you tools to reverse that, but the workflow still becomes:

open → download → work → remember to make online-only again.

That is not a deal-breaker. Dropbox remains one of the strongest choices if mature sync and sharing behaviour matters more than the storage model itself.

Google Drive: Stream is excellent for saving disk, but the cache follows your working set

Google's Drive for desktop makes the distinction explicit: Stream keeps files primarily in the cloud, whereas Mirror keeps a full local copy.

Google says streamed files use very little computer space, but local storage is still used when you work on files and for recently or frequently used content. That makes Stream a strong fit for ordinary office files and an enormous archive that you access selectively.

The catch is workload sensitivity.

Google's own documentation notes that applications doing extensive writing, video editing or high-resolution photo editing can work better with mirrored files. That matters because a photographer or video editor may start with “I want everything streamed” and discover that the actual editing application pushes them toward a more local workflow.

So Google Drive is excellent when the archive coexists with Google Workspace and you mostly open a small slice of it. It is less compelling if your main requirement is simply a giant folder-based archive that should behave like an extra drive across Windows, macOS and Linux.

iCloud: the best Apple-native experience, but the least deterministic eviction model here

For Apple users, iCloud Photos is the hardest service in this list to replace cleanly because it is not just generic file storage. It is deeply integrated with the Photos app, iPhone camera workflow and Apple device ecosystem.

With Optimize Mac Storage enabled, Apple can keep full-resolution originals in iCloud and smaller versions locally when Mac storage is constrained. Apple also states that recent files and optimised photo versions may remain on the Mac.

That makes iCloud convenient, but also less explicit than the other four services for people who want folder-level storage engineering. The operating system decides when it needs to reclaim space. If your Mac has plenty of free disk, optimisation does not necessarily mean the full local footprint disappears immediately.

If your problem is “my Apple Photos library is too large for my Mac”, iCloud is often still the most natural answer.

If your problem is “I want a multi-terabyte folder archive that I can manage predictably across several operating systems”, iCloud is a weaker fit.

OneDrive: Files On-Demand is strong, especially if Windows is already home

OneDrive's Files On-Demand model is one of the clearest in the group.

Online-only files appear in File Explorer but do not take up normal local storage. Open one and it becomes locally available. If you need the space back, right-click and choose Free up space. You can also mark folders as Always keep on this device when you want a guaranteed local copy.

Windows Storage Sense can automate part of the cleanup by returning older locally available OneDrive files to online-only state.

For a Windows-first household or Microsoft 365 user, this is difficult to argue against. The storage system is already integrated into the OS and the surrounding subscription can include Office applications that pCloud does not replace.

The weakness appears when Office integration is not actually part of your requirement. If your job is mostly “store 2 TB of photos, video and files and access them from different systems,” then Microsoft 365 can become a larger ecosystem purchase than the problem requires.

pCloud: the real advantage is not “cloud-only” — it is architectural separation

This is where pCloud becomes more interesting than a generic affiliate comparison.

pCloud separates two concepts that users often accidentally blur together:

1. pCloud Drive — a virtual drive designed to let you browse and work with cloud files without keeping the whole library locally.
2. Sync — a separate two-way mirroring feature for folders where you intentionally want local copies.

That means a 2 TB archive can live in pCloud Drive as a cloud-primary library, while only a 50 GB active-work folder is synced locally.

You are not depending on a single folder that constantly changes between online-only and downloaded states. You are choosing which storage model applies to which data set.

This matters most to users whose laptops are permanently smaller than their archives.

pCloud still uses cache — and that caveat matters

pCloud Drive is not magic. The desktop app uses local cache for performance and for file transfers. pCloud documents a configurable cache and recommends maintaining free disk space for it.

This is why our existing pCloud Drive cache explanation is important before treating the virtual drive as “zero local disk.”

But pCloud gives you another useful path for very large ingestion jobs: its Uploads feature is designed for one-way uploads without relying on the local disk cache used by copy-and-paste into the virtual drive. That is unusually relevant if you are trying to migrate a multi-terabyte archive from an external hard drive through a laptop with little free SSD space.

In practical terms:

• Browse/open cloud archive: pCloud Drive.
• Keep a working folder mirrored locally: Sync.
• Send a large one-way batch from an external drive: Uploads.

That separation is the strongest pCloud argument in this particular comparison.

A 3 TB photo/video archive exposes the differences quickly

Imagine this setup:

• 512 GB laptop SSD
• 3 TB photo/video archive
• 200 GB actively edited each year
• external drive still kept as a second copy
• archive must be available from Windows and macOS

A full mirror is impossible. You need a cloud-primary design.

Dropbox

Keep most folders Online-only and only active folders offline. Good workflow, but opened files can accumulate locally and may need to be returned to online-only state.

Google Drive

Stream the archive. Strong option, especially if you already use Google Workspace. High-resolution editing may still work better with mirrored/local working folders.

iCloud

Excellent if this is fundamentally an Apple Photos library. Less attractive if the archive is a cross-platform folder structure and you want explicit control over which directories occupy local disk.

OneDrive

Files On-Demand handles the storage problem well. Particularly compelling on Windows. If Office/Microsoft 365 is not part of the job, the ecosystem advantage becomes less important.

pCloud

Keep the archive in the virtual pCloud Drive, sync only active projects, and use Uploads for large one-way ingestion where local cache pressure would otherwise matter.

That is the identity test: if you recognise your setup as “my archive is permanently larger than every laptop I own,” pCloud's storage-first architecture starts to make more sense than choosing a cloud service primarily because it came bundled with an office suite or phone ecosystem.

Where pCloud is actually weaker

A comparison that hides the weaknesses is not useful.

Choose Google Drive over pCloud if live Google Docs/Sheets collaboration is central to your work.

Choose OneDrive over pCloud if Microsoft 365 and deep Windows/Office integration are core requirements.

Choose iCloud over pCloud if your primary library is Apple Photos and the native iPhone/Mac photo experience matters more than cross-platform folder control.

Choose Dropbox over pCloud if your organisation already depends on Dropbox's mature sharing/sync workflows and switching the storage model would create more operational pain than it removes.

Choose pCloud when the recurring pattern is different: you keep a large, long-lived file archive; the archive is much larger than your laptop; you want the cloud storage itself to be the centre of the workflow; and you do not need your storage provider to double as a productivity suite.

The second pCloud advantage appears only after you know the archive is long-term: Lifetime

For a temporary project, Lifetime pricing is irrelevant.

For a photo/video archive that you expect to keep for many years, it becomes part of the technical decision because the storage job itself is durable.

pCloud currently offers Lifetime consumer tiers alongside monthly and annual plans. On the public page checked on 21 August 2026, the displayed Lifetime prices were:

Those prices can change. “Lifetime” also does not mean legally infinite: pCloud's terms define the consumer Lifetime period as the account holder's lifetime or 99 years, whichever is shorter.

The point is not that a one-time payment automatically beats Dropbox, Google, Apple or Microsoft. The point is that the Big 4 consumer storage models are fundamentally recurring, while pCloud gives a long-term archive user a different financing option.

If you already know the archive will exist for years, repeatedly paying for the same storage requirement becomes a cost you can actually compare rather than an abstract future expense.

For the break-even logic, see our full pCloud Lifetime analysis.

Do not confuse cloud storage with backup

A cloud-primary archive can solve local capacity pressure and still leave you with a weak recovery design.

If accidental deletion, ransomware, account lockout or provider-side problems matter, keep another independent copy. For a large media library, an external drive or NAS can still be valuable even when the day-to-day archive lives in the cloud.

That distinction is covered in Cloud Backup vs Cloud Storage and Cloud Storage vs External Hard Drive.

The practical decision tree

Use this order instead of starting with brand loyalty:

1. Is the library larger than your internal SSD? If no, a mirrored model may be simplest.
2. Do you need a full local copy for heavy editing? If yes, keep an active local working set even if the archive is cloud-primary.
3. Is your workflow tied to Apple Photos? iCloud deserves priority.
4. Is your workflow tied to Google Workspace? Google Drive Stream is difficult to beat.
5. Is your workflow tied to Microsoft 365/Windows? OneDrive Files On-Demand is the natural baseline.
6. Is mature sync/sharing itself the priority? Dropbox remains strong.
7. Is the storage job mostly a long-term cross-platform archive? This is the branch where pCloud Drive + selective Sync + optional Lifetime pricing becomes unusually coherent.

What not to do when your SSD is already nearly full

Do not solve a local-space problem by randomly deleting files inside a synced cloud folder. In Dropbox, OneDrive and other sync systems, deletion can propagate to the cloud and other devices.

Do not assume “online-only” means a file can be opened with no temporary local storage requirement.

Do not migrate a multi-terabyte library before confirming how the destination client handles cache, failed transfers and unsynced local changes.

Do not turn a single cloud account into your only copy of irreplaceable photos or videos.

And do not buy Lifetime storage merely because the one-time price feels satisfying. The purchase only makes sense after the storage model and capacity fit are already clear.

Bottom line

Dropbox, Google Drive and OneDrive all have legitimate cloud-only modes. iCloud is exceptionally good for Apple-native photo storage. pCloud is not the only way to save SSD space.

The reason pCloud deserves a stronger look for a large long-term archive is more specific:

• pCloud Drive is cloud-primary by design;
• Sync is a separate decision rather than the default model for every folder;
• cache settings are exposed;
• large one-way Uploads can avoid the normal local-cache staging path;
• the service is cross-platform and storage-first;
• and Lifetime pricing gives a durable archive a financing model the Big 4 consumer services generally do not offer.

If you keep recognising yourself in the same pattern — the archive keeps growing, every new laptop is still smaller than it, and you are tired of treating local SSD capacity as the centre of the storage plan — then the unresolved decision is no longer whether cloud-only files exist. All five services can do that in some form.

The unresolved decision is whether you want your next storage system built around an ecosystem, or around the archive itself.

Sources and verification

Primary documentation checked on 21 August 2026:

1. Dropbox Help — <https://help.dropbox.com/sync/make-files-online-only>
2. Google Drive Help — <https://support.google.com/drive/answer/13401938?hl=en>
3. Google Drive Help — <https://support.google.com/drive/answer/17196458?hl=en>
4. Apple Support — <https://support.apple.com/guide/photos/optimize-storage-in-photos-on-mac-phta9b4673b4/mac>
5. Apple Support — <https://support.apple.com/en-lamr/guide/mac-help/sysp4ee93ca4/mac>
6. Microsoft Support — <https://support.microsoft.com/en-us/onedrive/save-disk-space-with-onedrive-files-on-demand-for-windows>
7. Microsoft Support — <https://support.microsoft.com/en-us/onedrive/use-onedrive-and-storage-sense-in-windows-10-to-manage-disk-space>
8. pCloud Help — <https://help.pcloud.com/article/pcloud-drive-vs-pcloud-sync>
9. pCloud Help — <https://help.pcloud.com/article/low-disk-space-warning-in-pcloud-drive>
10. pCloud Help — <https://help.pcloud.com/article/uploading-downloading-organizing>
11. pCloud pricing — <https://www.pcloud.com/cloud-storage-pricing-plans.html>
12. pCloud Terms — <https://pcdn-www.pcloud.com/terms_and_conditions.html>

Publication notes

• Re-check pCloud public pricing immediately before batch publication.
• Do not imply pCloud Drive uses zero local disk; cache behaviour is explicitly documented.
• Do not imply the Big 4 lack cloud-only storage; the article's pCloud argument depends on architecture and long-term storage fit, not a false feature monopoly.
• Planned batch cross-links after publication: 008-google-drive-streaming-uses-disk-space, 009-icloud-drive-optimize-mac-storage-disk-space.
• No Cloudflare deployment until batch reaches 50/50.