What Happens to Your Files If Your Internet Goes Down?

The Short Answer

If your files are on a local network — a shared folder on a colleague's machine, a NAS, or any on-premise storage — an internet outage has zero effect on your ability to access them. Local network file sharing does not use the internet.

If your files are in cloud storage — Dropbox, Google Drive, OneDrive, SharePoint — an internet outage cuts off access to any files not already downloaded and cached locally.

The rest of this article unpacks what this means for each tool your office may be using.

Scenario 1 — Files on a Local NAS or Shared Folder

When internet goes down: Nothing changes. Your office LAN (Local Area Network) continues to operate. The NAS, shared folders, and all machines connected to the same router or switch can still communicate with each other at full local network speed.

Your team can continue:

• Accessing shared project folders
• Transferring files between machines
• Printing to networked printers
• Using any software that reads from a local network path

What stops working: Email, cloud services, web browsing, video conferencing, and any software that requires a connection to a remote server (SaaS applications, cloud accounting, etc.).

Local file access is completely unaffected.

Scenario 2 — Files in Dropbox

Files that have been synced to your local drive: Accessible. When Dropbox syncs a file, it writes a copy to your local machine at C:\Users\YourName\Dropbox\.... This local copy is readable even without internet.

Files that exist in Dropbox but have not been made available offline: Not accessible in Dropbox's default "online-only" mode. Dropbox shows the file icon but clicking it requires downloading from Dropbox servers — which fails without internet.

File changes made during the outage: Saved to the local Dropbox folder. When the internet reconnects, they sync automatically.

Team collaboration during outage: If two people edit the same Dropbox file offline simultaneously, a sync conflict will occur when internet reconnects. Dropbox creates a conflict copy — both versions survive, but someone needs to manually resolve the conflict.

Scenario 3 — Files in OneDrive

Same behaviour as Dropbox. Files explicitly marked "Always keep on this device" are accessible offline. Files in online-only mode are not accessible during an outage.

OneDrive's "Always available offline" setting is per-file or per-folder: right-click the file/folder in File Explorer → OneDrive → Always keep on this device.

SharePoint (online): Not accessible during an outage. SharePoint Online is a web service — it requires internet access entirely.

Scenario 4 — Files in Google Drive

Google Drive's desktop sync client (Drive for Desktop) maintains local copies of files you have specifically made available offline. Google Docs, Sheets, and Slides can be edited offline and sync when reconnected. Large binary files (videos, PSDs, DWGs) are not available offline unless explicitly downloaded.

During an outage: Google Workspace web apps (Docs, Sheets) become unavailable. Files physically downloaded to your machine remain accessible. The Google Drive sync folder shows the last synced state but cannot update.

Scenario 5 — LAN Transfer Tools

Application-level LAN transfer tools like Oxolan and LocalSend operate entirely on the local network. An internet outage has no effect on their operation.

• Both machines are on the same local network → File transfer works normally
• No cloud routing → No internet required
• No authentication server → The application does not check in with a server

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How to Make Your Office Resilient to Internet Outages

For file access during outages:

1. Keep a local copy of active project files. Encourage staff to save working files to the local machine and sync to cloud when complete, rather than working exclusively from cloud-synced folders.

2. Use local network sharing for files shared between colleagues. Files on a local NAS or shared folder are accessible regardless of internet status.

3. Mark frequently needed cloud files as "Always available offline." In Dropbox and OneDrive, this ensures a local copy exists on the machine that needs it.

For internet-dependent workflows:

4. Identify which workflows stop completely without internet and plan for them:

   • Cloud accounting (Xero, QuickBooks Online): requires internet
   • Cloud project management (Asana, Monday, Jira): requires internet
   • Video calls (Teams, Zoom, Meet): require internet
   • Email: requires internet

5. Consider mobile data as a failover. A team of 5 people can share one smartphone's hotspot for essential internet tasks (email, bank access) during a short outage. For sustained outages, a 4G/5G router with a data SIM provides better coverage.

The Ideal Outage-Resilient Office Architecture

File type	Storage location	Outage impact
Active project files	Local NAS + local machine copies	None
Reference files and templates	Local NAS	None
Client deliverables being prepared	Local machine	None
Cloud backup copies	Cloud (Backblaze, S3)	Cannot update during outage; fine
Files for remote access by clients	Cloud (Dropbox, Google Drive)	No access during outage
SaaS applications	Cloud	Unavailable during outage

Frequently Asked Questions

Can we still access files from home if the internet at the office is down? No. If the office internet is down, remote access via VPN or cloud sync from home to the office is also unavailable. If you need remote access, files need to be in cloud storage (accessible from home separately) or pre-downloaded to the home machine.

Does a power cut affect local file access? Yes. A power cut takes down the router, switch, and host machine — ending LAN access. A NAS with a UPS (Uninterruptible Power Supply) maintains local access during a brief power interruption, giving time to save work and shut down gracefully before batteries run out.

How long do internet outages typically last? This varies enormously by location and ISP. For business planning: most outages are resolved within 4 hours. Prolonged outages (over 24 hours) often relate to physical infrastructure damage. Having 4 hours of operational capability without internet handles the majority of outage scenarios.

Should we have a backup internet connection? For practices where internet access is genuinely business-critical (accounting, SaaS-heavy workflows, frequent client video calls): a second internet connection from a different provider (or a 4G/5G router as backup) provides true redundancy. Load-balancing routers can use both connections simultaneously and fail over automatically.