TecnoOrange 
I lost three years of family photos in 2021 because I had no backup. A hard drive failure and everything was gone. Since then, I became obsessed with understanding the difference between local backup and cloud backup, and today I want to share what I learned so you don’t make the same mistake. Spoiler: the right answer isn’t one or the other — it’s both.
Table of contents
Table of contents
What is a local backup and how does it work
A local backup is a copy of your data stored on a physical device you control directly. It can be an external hard drive, a NAS (Network Attached Storage), a USB flash drive, or even a second internal drive in your computer.
The fundamental advantage is absolute control. Your data never leaves your house, nobody else can access it, and copy speed depends only on the hardware you use. A backup to a USB 3.2 external SSD can reach 500-1000 MB/s, meaning copying 100 GB of photos takes less than 3 minutes.
I use a Synology NAS with two mirrored drives (RAID 1) for my local backups. Every night, my computer automatically copies all new files to the NAS. If something fails on my PC, I have everything backed up without lifting a finger.
Heads up: A local backup in the same house as the original isn’t a real backup against fire, flooding, or theft. If your house burns down, you lose the original AND the copy. You always need a second copy offsite.
Local backup costs are predictable. You buy a 4TB hard drive for about $80-100 and have more than enough space for years. No monthly fees, no internet dependency, and consistent performance.
The most common types of local backup:
- External USB hard drive: Simplest and cheapest. Connect, copy, disconnect.
- Home NAS: Accessible via WiFi/LAN, ideal for families.
- Second internal drive: Copy on the same computer, vulnerable to electrical failures.
- Portable SSD: For small, quick backups.
What is a cloud backup and how does it work
A cloud backup stores your data on remote servers managed by a company. Your files travel over the internet to data centers owned by Google, Apple, Microsoft, Backblaze, or any other provider.
The big advantage is accessibility. You can access your photos from your phone in Japan, recover a document from a café in Berlin, or restore your entire computer after a theft. As long as you have internet, you have your data.
Cloud backup works automatically in the background. Services like Google Drive, iCloud, or Backblaze continuously sync your files without you having to do anything. You create a document, and within seconds it’s copied to the cloud.
Pro tip: Don’t confuse syncing with backup. Google Drive syncs: if you delete a file from your computer, it’s also deleted from the cloud. Backblaze does real backup: if you delete something, the copy remains for 30 days (or longer with extended retention settings).
The cost is recurring. Google One charges $2.99/month for 200GB, iCloud $0.99/month for 50GB, and Backblaze $99/year for unlimited backup of one computer. Over time, the cloud can be more expensive than buying a hard drive.
| Feature | Local backup | Cloud backup |
|---|---|---|
| Upfront cost | $80-200 (drive/NAS) | $0 (limited free tier) |
| Monthly cost | $0 | $1-10/month |
| Copy speed | Very fast (500+ MB/s) | Depends on internet |
| Recovery speed | Immediate | Hours to days |
| Remote access | No | Yes |
| Protection from theft/fire | No | Yes |
| Data privacy | Total | Depends on provider |
Security: Where are my data safer?
This is the question I get asked most, and the answer is nuanced.
Local backup: physical security
With local backup, you control physical security. Nobody can hack a hard drive disconnected in your drawer. Governments can’t request your data from a company because the company doesn’t exist. Privacy is absolute.
But physical security has its own risks. A theft, fire, flood, or simply a mechanical hard drive failure (HDDs have a 3-5 year average lifespan), and you lose the copy.
Heads up: Mechanical hard drives (HDDs) die without warning. If you use HDDs for backup, replace them every 3-4 years. SSDs are more reliable but more expensive per GB.
Cloud backup: digital security
In the cloud, your data is protected against physical disasters. Google’s or Amazon’s data centers have power redundancy, fire protection, and copies across multiple geographic locations. Your house flooding doesn’t affect your photos on Google Photos at all.
But you introduce digital risks. Hacks, data breaches, privacy policy changes, or the company going bankrupt and your data disappearing. Unlikely, but possible.
The 3-2-1 backup rule is the industry standard:
- 3 copies of your data
- 2 different media (hard drive + cloud)
- 1 copy offsite (the cloud)
Speed: copying and recovering data
Speed matters a lot, especially when you need to recover data urgently.
Copy speed (backup creation)
For creating the backup, local wins by a landslide. Copying 1TB to an external USB 3.2 hard drive takes about 20-30 minutes. Uploading 1TB to the cloud with a 100 Mbps connection takes about 22 hours. They’re not comparable.
With gigabit fiber connections, the cloud improves, but it’s still slower than a local SSD. And if you’re unlucky enough to have DSL or 4G, forget about large cloud backups.
Recovery speed (restore)
Here the difference is dramatic. Recovering a file from a local drive takes seconds. Recovering 500GB from the cloud can take hours or even days depending on your connection.
Some services like Backblaze offer physical hard drive shipping by courier if you need to recover large amounts of data. It costs about $189 but saves you days of downloading.
| Operation | Local (USB 3.2 SSD) | Cloud (100 Mbps) | Cloud (1 Gbps) |
|---|---|---|---|
| Copy 100GB | ~3 min | ~2.2 hours | ~13 min |
| Copy 1TB | ~30 min | ~22 hours | ~2.2 hours |
| Recover 10GB | ~30 sec | ~13 min | ~80 sec |
My recommendation: the hybrid strategy
After losing my data and rebuilding my backup strategy, my conclusion is clear: use both options.
Daily local backup: A NAS or external hard drive that updates automatically every night. For critical data, weekly copy to a second drive stored offsite (at the office, at a family member’s house).
Continuous cloud backup: A service like Backblaze or Google One that automatically syncs your most important files. Photos, documents, and critical configurations.
This covers all scenarios:
- Drive failure: Local backup saves you immediately.
- Theft or fire: Cloud backup saves you because the copy is offsite.
- Ransomware attack: Both copies, as long as the cloud has versioning.
- Human error (you delete something): Cloud versioning lets you recover previous versions.
Pro tip: Test your backups at least once a year. Restore a random file from your local copy and another from the cloud. There’s nothing worse than discovering your backup didn’t work when you actually need it.
FAQ: Frequently asked questions
Is it safe to upload my photos to the cloud?
Major providers (Google, Apple, Microsoft) use end-to-end or in-transit encryption. It’s quite safe, but not infallible. If you’re concerned, encrypt your files before uploading with tools like Cryptomator.
How much backup space do I need?
General rule: 2x your current data size. If you have 500GB of data, you need at least 1TB of backup space for historical versions.
Do I lose my data if I close my cloud account?
Yes, if you haven’t downloaded your data first. Google, Apple, and Microsoft provide a grace period before permanent deletion. Always keep at least one local copy regardless.
What’s better for photos: Google Photos or a hard drive?
For convenience and remote access, Google Photos. For total control and privacy, a hard drive. Ideally, use both: Google Photos for daily viewing, hard drive for permanent archival.
Conclusión
The difference between local backup and cloud backup isn’t a competition: they’re complementary solutions. Local gives you speed, control, and privacy. The cloud gives you accessibility, disaster protection, and automation. The winning strategy is using both, following the 3-2-1 rule. Don’t wait until you lose your data like I did to start making backups.