iCloud is Apple’s cloud syncing and storage system built into macOS through your Apple Account. It can keep files, photos, mail, passwords, settings, and device features available across Apple devices.
This guide applies to Macs signed in to an Apple Account on recent macOS versions.
Does This Affect You?
Use this if you see iCloud toggles in System Settings and want to know what they actually change on the Mac.
What iCloud Does
- Signing in unlocks separate services such as iCloud Drive, Photos, Mail, Keychain, Find My, and more.
- iCloud syncs active data across devices; it is not the same as a frozen traditional backup.
- You can turn services on or off individually.
- Storage is shared across iCloud Drive, Photos, device backups, Mail, and other iCloud data.
- The free 5 GB plan fills quickly when Photos or backups are involved.
Main iCloud Toggles
- iCloud Drive: syncs files saved in iCloud Drive and optionally Desktop and Documents.
- Photos: uploads and syncs your Photos library across Apple devices.
- iCloud Mail: provides and syncs an iCloud email account.
- Keychain: syncs saved passwords, Wi-Fi passwords, passkeys, and payment details.
- Find My Mac: helps locate, lock, or erase a lost Mac.
- Mac backup reality: Macs do not have one full iCloud Backup switch like iPhone, but iCloud services can protect much of your daily data.
iCloud Notes
Check Storage
Open iCloud settings and review the storage bar to see what is filling the plan.
iCloud+
Paid iCloud+ tiers add more storage and features such as Private Relay, Hide My Email, and custom email domains.
Family Sharing
A paid iCloud+ storage plan can be shared with up to six family members while each person keeps files and photos private.
Choose Only What You Need
You can use iCloud Photos without iCloud Drive, or Keychain without Mail. Each service is separate.
Sources
- Apple Support: What is iCloud
- Apple Support: Set up iCloud on your Mac
- Apple: iCloud