iCloud is one of Apple's great achievements and also one of its great sources of confusion. Most people who use it do not have a clear picture of what it is doing. They have a vague sense that their photos are "in the cloud," that their contacts sync somehow, and that there is a monthly charge that they are not entirely sure they agreed to.
This is not a criticism. iCloud is genuinely useful. It is also genuinely capable of surprising you in ways that are expensive, inconvenient, and — occasionally — alarming.
Here is what you actually need to know.
What iCloud Is, In Plain English
iCloud is Apple's online storage and synchronisation service. It stores your photos, backs up your iPhone, syncs your contacts and calendars across devices, and — if you have enabled it — mirrors your Mac desktop and documents to Apple's servers.
You get 5GB free. This is not very much. A modern iPhone photo takes about 4-8MB. Five gigabytes of storage holds roughly 600-1,200 photos. If you have more than that — and almost everyone does — iCloud will tell you it is full and begin politely but persistently suggesting that you upgrade.
The paid plans: 50GB for €0.99/month, 200GB for €2.99/month, 2TB for €9.99/month. The 200GB plan is the one most individuals actually need.
The Feature That Catches Most Expats Off Guard
Desktop & Documents Folders. When enabled, this feature moves the contents of your Mac's Desktop and Documents folders to iCloud, replacing them with online versions. This is wonderful for access across devices. It is less wonderful when you are on a slow connection, because your files are not actually on your Mac — they are in the cloud, and your Mac is downloading them on demand.
In Lagos, most residential internet is perfectly adequate. But if you are working from a rental apartment with a struggling router, or from a café, and your Mac seems to pause before opening documents — this is almost certainly why.
Check it: System Settings → [Your Name] → iCloud → iCloud Drive → Desktop & Documents Folders. If it is on and you want your files locally, turn it off. macOS will download everything back to your Mac — give it time, especially if you have a lot of documents.
The Photo Library Question
iCloud Photos keeps your entire photo library synced across all your devices and stored in Apple's cloud. This is genuinely brilliant when it works well. The consideration is storage: if you have fifteen years of photos, you may have tens or hundreds of gigabytes stored in iCloud, and the monthly cost reflects that.
When you move to Lagos and connect your Mac to iCloud Photos for the first time, it will begin downloading everything to your Mac — or keeping small previews locally and downloading full versions on demand, depending on your storage optimization settings. Either way, it will occupy your internet connection for some time.
iCloud Keychain — The One You Should Definitely Have On
iCloud Keychain stores your passwords, credit card numbers, and WiFi passwords securely across all your Apple devices. If you are not using it, you are either using a separate password manager (fine) or you are remembering your passwords yourself (not fine — you are not remembering them, you are reusing them, and that is a security problem).
Enable it: System Settings → [Your Name] → iCloud → Passwords & Keychain. Turn it on. Your passwords become available on every Apple device you own, encrypted end-to-end.
Not sure what iCloud is doing on your Mac?
A Mac health check includes a review of iCloud settings, storage usage, and what is syncing where. It takes about twenty minutes of an hour-long visit and often reveals things that have been quietly happening for months. Same day, in your language.
Book a health check →iCloud, understood and configured correctly, is an excellent service. iCloud, left to its own devices, is an excellent mystery. There is no reason to live with the mystery.