Open a Mac, poke around, and you will run into the word storage in at least three completely different places — and they mean three different things. One is a cloud subscription. One is the physical SSD soldered inside your Mac. One is a list of things you have bought that take up almost no room at all. People pay Apple for the wrong one every day because the labels look alike.
This guide untangles them. By the end you will know exactly which number is which, where each one lives in Settings, and which one is actually costing you money or slowing you down. If you are here because a bar is red and something says full, this explainer tells you which problem you have — then points you at the exact fix.
The three "storages" people mix up
Here is the whole confusion in one table. Read it once and the rest of the article is just detail.
| What it is | Where it lives | Do you pay for it? | Runs out? |
|---|---|---|---|
| iCloud storage (iCloud / iCloud+) | Apple’s servers (the cloud) | Free 5GB, then a monthly subscription | Yes — fills with photos, backups, files, Messages |
| Device storage (the SSD) | Physically inside your Mac | Paid once, when you buy the Mac | Yes — fills with apps, files, System Data |
| Purchases (your Apple Account library) | A list tied to your Apple ID | Already paid — apps, music, movies you own | No — it takes up no space until you download it |
The trap: all three can say storage in the Settings app, and two of them can say full. The one that never fills is your Purchases — those live on Apple’s servers as a record of what you own and only use space when you actually download the item.
1. iCloud storage — the cloud quota
This is the one people mistake for everything else. iCloud is Apple’s online storage. Every Apple ID gets 5GB free, and 5GB fills almost instantly once iPhone backups and iCloud Photos are switched on. Paid tiers are branded iCloud+.
Where it lives: System Settings → [your name] at the top → iCloud. The colored bar at the top is your cloud quota — not your Mac’s disk.
What eats it: iPhone/iPad backups, iCloud Photos, iCloud Drive files, Messages in iCloud, and Mail. It is shared across every device signed into the same Apple ID, which is why an iPhone can fill the iCloud your Mac shares.
iCloud+ pricing tiers (2026): 50GB, 200GB, and 2TB are the mainstream plans, with 6TB and 12TB options for heavy users. It is a recurring monthly charge — the moment you stop paying, the extra space goes away (your files are not deleted immediately, but new syncing stops until you are back under the limit).
If your iCloud bar is red, that is a cloud-quota problem, and it has its own playbook: iCloud Storage Full on a Mac? What to Offload and Free.
2. Device storage — the SSD inside your Mac
This is the physical drive. When a Mac is advertised as 256GB or 512GB, that is the size of this SSD. It was paid for once — when the Mac was bought — and on every modern Mac it is soldered to the logic board, so it cannot be upgraded later. The number you buy is the number you keep.
Where it lives: System Settings → General → Storage. The bar here is color-coded by category (Apps, Documents, macOS, System Data, and so on). This is your disk, and it is completely separate from the iCloud bar.
What eats it: installed apps, your files, the macOS system itself, and the notorious System Data bucket (caches, logs, local snapshots). A full SSD is what triggers "your disk is almost full" and "not enough space to install macOS."
If this bar is the one that is full, the fixes are different from the cloud ones — see MacBook Storage Full? Free Up Space Fast. And because the SSD can never be enlarged, the size you choose at purchase matters more than on any other computer: 256GB vs 512GB and how much storage you actually need.
3. Purchases — your Apple Account library
This is the one that is not really storage at all, even though Apple lists it under your account. Everything you have ever bought or downloaded — apps, songs, movies, books — is recorded against your Apple ID. That record lives on Apple’s servers and takes up zero space on your Mac and zero iCloud quota until you actively download the item to a device.
Where it lives: the App Store app (click your name in the bottom-left, then look at your purchased list) and the Music/TV/Books apps for media. Family Sharing purchases show up here too.
Why it matters: you can safely delete a purchased app from your Mac to reclaim SSD space and re-download it any time for free — the purchase never expires. Deleting the app removes it from the disk (device storage) without touching your Purchases (the account record) or your iCloud (the cloud quota). Same idea for a movie you already own.
If your App Store Purchased list looks empty, that is usually a display quirk, not lost purchases: App Store "Purchased" Tab Missing?
How to read your two storage bars at a glance
- iCloud bar red, disk fine? Cloud-quota problem. Offload photos/backups or add iCloud+ — buying a bigger Mac will not help.
- Disk bar red, iCloud fine? Device-storage problem. Clear the SSD, and if it keeps filling, the drive is simply too small for how you use it.
- Both red? Two separate jobs — do them separately. They do not fix each other.
- Neither red, but "Purchases" is huge? Ignore it. Purchases are a record, not space used.
Should you pay Apple, or buy a bigger Mac?
This is where the three-way confusion costs the most. If your disk is the thing that is always full, paying monthly for iCloud+ does nothing — iCloud is a different pool. iCloud+ only helps a full cloud bar.
And because a Mac’s SSD is soldered and can never be enlarged, a chronically-full 256GB Mac is not a cleanup problem — it is a too-small-drive problem. On a refurbished Mac the jump to more storage is far cheaper than on a new one. At LuxuriousComputers a certified MacBook Air M1 starts at $450, the M2 Air at $549, and higher-capacity configs cost a fraction of Apple’s new-Mac storage upgrades. Every Mac ships tested with a warranty — browse the current Apple clearance lineup for the best per-gigabyte value.
The honest rule: pay for iCloud+ when your cloud workflow needs it (device backups, shared photo library). Buy more device storage when your disk is the bottleneck. Do not confuse a recurring subscription for the wrong pool.
Related guides
- iCloud Storage Full on a Mac? What to Offload and Free
- MacBook Storage Full? Free Up Space Fast
- 256GB vs 512GB MacBook Storage
- How to Turn On iCloud Drive on a Mac
- Manage Apple ID Subscriptions & Payment
- All guides →
Frequently Asked Questions
Is iCloud storage the same as my Mac’s storage?
No. iCloud storage is space on Apple’s servers (shared across your devices, 5GB free then a paid iCloud+ plan). Your Mac’s storage is the physical SSD inside the machine. They have separate bars in Settings and filling one does not affect the other.
Do my purchased apps and movies use up storage?
Only when you download them. Your Purchases are a record tied to your Apple ID and live on Apple’s servers using no space. Delete a purchased app to free SSD room and re-download it free any time — the purchase never expires.
Why does my iCloud say full when my Mac has plenty of free space?
Because they are different pools. A full iCloud (usually iPhone backups and iCloud Photos) has nothing to do with your Mac’s empty SSD. See iCloud Storage Full on a Mac?
Should I pay for iCloud+ or buy a Mac with more storage?
Depends which bar is red. Pay for iCloud+ if your cloud (backups, photo library) is full. Buy more device storage if your disk is full — and since a Mac’s SSD is soldered and unupgradeable, choose enough at purchase. A refurbished higher-capacity Mac from Apple clearance is usually cheaper than years of the wrong subscription.
What are Apple’s iCloud+ storage tiers?
As of 2026 the mainstream iCloud+ plans are 50GB, 200GB, and 2TB, with 6TB and 12TB options for heavy users. Every Apple ID includes 5GB free. It is a recurring monthly charge; stop paying and syncing pauses until you are back under the free limit.