Cloud storage keeps your files on remote servers run by a provider (Microsoft, Google, etc.) instead of only on your PC. With the client app or website, files sync across devices and you can share links with others anywhere there is internet—no need to be on the same Wi‑Fi (see section 9.1 for LAN).
When cloud storage helps
- Access documents from PC, phone, and tablet with the same account.
- Send a download link to someone in another city or country.
- Automatic backup if your laptop is lost or the hard drive fails (for synced folders).
- Collaborate on Office or Google files with version history in the cloud.
Three ideas to understand
| Concept | Meaning |
|---|---|
| Sync | Files in a chosen folder (e.g., Desktop, Documents) stay identical on your PC and in the cloud. Edit locally → upload; edit online → download to PC. |
| Backup | A copy in the cloud protects against device loss. Sync folders act as live backup; some services offer separate “backup” of entire drives. |
| Share link | You generate a URL so others can view or download a file without LAN access. Set expiry or password when the service supports it. |
Common cloud services
Free tiers have storage limits; business plans add admin controls. Trademarks belong to their respective owners.
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OneDrive
Built into Windows and tied to a Microsoft account. Syncs Desktop, Documents, and Pictures by default on many new PCs. Integrates with Word, Excel, and Teams. Appears in File Explorer under OneDrive.
- Best for: Windows users; Office documents; school/work accounts (Microsoft 365).
- Note: Free space is limited (often 5 GB personal); check which folders are syncing to avoid filling the quota.
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Google Drive
Part of a Google account (Gmail). Works in the browser and via Backup and Sync / Google Drive for desktop. Strong for Google Docs, Sheets, Slides, and sharing with “anyone with the link.”
- Best for: Android phones, Gmail users, collaborative Google documents.
- Note: Storage is shared with Gmail and Photos on consumer plans—monitor total usage.
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Dropbox
Early pioneer of simple folder sync. The desktop app adds a Dropbox folder; anything you put inside syncs. Good third-party integrations and reliable sharing links.
- Best for: Cross-platform teams that want straightforward folder mirroring.
- Note: Free tier is small; paid plans are common for work use.
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iCloud Drive
Apple’s cloud for iPhone, iPad, and Mac. On Windows, install iCloud for Windows to sync photos, files, and bookmarks with an Apple ID.
- Best for: Households using iPhone/iPad alongside a Windows PC.
- Note: Windows integration is less seamless than on Mac; verify sync status in the iCloud app.
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Baidu Netdisk (百度网盘) / Tencent Weiyun (腾讯微云)
Widely used in China for personal storage and link sharing. Large free quotas on some plans; desktop and mobile clients available. Useful when collaborators are in China and international services are slow or blocked.
- Best for: Domestic sharing, archiving media, recipients without VPN.
- Note: Read terms on speed limits for free accounts; avoid storing sole copies of critical data without a second backup.
Getting started on Windows (OneDrive example)
- Sign in with a Microsoft account: Settings > Accounts > Email & accounts, or click the OneDrive cloud icon in the taskbar.
- Choose which folders to sync (Desktop, Documents, Pictures, or custom folders).
- Files show a cloud or check mark overlay in File Explorer—cloud-only files save space with Files On-Demand.
- Right-click a file or folder > Share to create a link, or copy to the synced folder and wait for upload to finish before sharing.
Cloud vs. LAN (section 9.1)
| Cloud | LAN | |
|---|---|---|
| Internet | Required | Not required |
| Speed | Limited by upload bandwidth | Very fast on local network |
| Remote access | Yes, anywhere | Same building/network only |
| Privacy | Data on provider servers—trust and encrypt | Data stays on your LAN |
Security and good habits
- Use a strong password and turn on two-factor authentication (2FA) on the cloud account.
- Before sharing, check whether the link is view-only or allows editing; set expiration when available.
- Do not put passwords, ID scans, or company secrets in a public share folder.
- Keep at least two backups for irreplaceable files (e.g., cloud + external drive)—sync is not a substitute for ransomware-aware backup.
- Review linked devices periodically and sign out of old PCs you no longer use.