A backup that stops working usually makes no noise. There is no error on the screen, and your phone keeps taking photos as if nothing had changed. The problem comes to light on the day you need to get something back: the worst possible moment to find out.
This post brings together the signs that the copies of your photos, videos and documents may no longer be complete or up to date: what they mean, where you can see them, and what to do when you find one. A backup is a copy of your files kept somewhere other than the device you use every day, so that you can recover them if the original is lost. In technical circles, the traces that show something is wrong are called indicators of compromise, or IOCs (Indicators of Compromise): here we apply them to the health of your backup.
It is the diagnostic deep dive on the recommendation about backing up photos and videos: making the copies is the prevention; recognising the signs is how you find out whether that prevention is still working for you.
What the indicators of a failing backup are
An indicator is an observable trace suggesting that something did not go the way it should have.
It is not proof. It is a signal that deserves a check: it may have a harmless explanation — a phone that went a few days without Wi-Fi, an external drive you plugged in yesterday rather than today — or it may mean that your copies have not been updated for weeks, or that some folders were never copied at all.
The value of these indicators lies in timing: noticing a stalled backup early means you can fix it while the originals are still on your device.
Why they matter more when your backup is automatic
An automatic backup is the right choice: it takes memory and good intentions out of the equation, and those are the first things to slip. But it has a side effect: you stop looking at it.
You switched it on once, perhaps years ago, and since then it has worked quietly in the background. If one day it stops — the storage is full, you changed your account password, an update altered a setting — it still looks active. It simply is not copying anything any more.
That is why the indicators are worth reading above all when you “know” you have a backup: the confidence of having one is exactly what makes it hard to notice that it has stopped.
Technical indicators
These are the ones your phone’s operating system, your cloud service or your backup program record and show in their settings. The cloud is storage space on external servers that you reach over the internet; syncing (synchronisation) is the mechanism that keeps the files on your device and in that space identical.
| Indicator | What it means | Why it matters | Where you see it | What to do |
|---|---|---|---|---|
| Last backup date not moving | The last completed copy dates back days, weeks or months | Everything you have created since then is not protected | Backup settings on your phone or computer, “last backup” section | Find the cause (storage, network, account) and start a manual backup, checking that it finishes |
| Cloud storage full or nearly full | Your online storage has reached its limit | Once the space runs out, new files stop being copied, often without further warnings | Your cloud service account page, “storage almost full” notifications | Free up space or add more; then check that the backup really starts again |
| Sync errors | Some files cannot be uploaded or updated | The blocked files stay only on your device, even if everything else looks fine | Warning icons on folders, a list of “items not synced” | Check which files are affected and solve one problem at a time |
| Backup paused because conditions are not met | The backup only runs on Wi-Fi, while charging or with enough battery, and those conditions never happen | If you rarely use Wi-Fi or never leave your phone charging, you can go unprotected for a long time | Messages such as “waiting for Wi-Fi” or “paused” in the backup settings | Create the opportunity: a night on charge with Wi-Fi on solves many cases |
| Folders or file types excluded | The backup copies photos but not videos, or leaves out a folder you now use | You feel covered for everything, but part of your files was never copied | The list of included folders, options for photos, videos and documents | Review what is included, especially after installing new apps that save files |
| Service account disconnected | Your device is no longer linked to the backup account, for example after a password change | The backup stops without anything seeming to change | Requests to sign in again, “sign in again” alerts in the settings | Sign back in through the official route and check the date of the next backup |
| External drive with errors or not recognised | Your computer does not see the drive, or reports read or write errors | Drives wear out: a copy on a failing drive may no longer be readable | Operating system messages when you plug the drive in, backup program reports | Copy whatever you can still read somewhere else, and plan to replace the drive |
| Version history missing or very short | The service keeps only the latest version of each file, or older versions for just a few days | If a file is deleted or damaged, the change spreads to the copy | Service settings, “previous versions” or “bin” | Check how long versions and deleted files are kept; if it is not long, add a second copy |
Signs you can observe yourself
These do not require you to open any dashboard: you notice them in everyday use or with a simple test.
| Signal | What it means | Why it matters | How you notice | What to do |
|---|---|---|---|---|
| Files missing from a test restore | When you recover some files from the backup, something is not there | This is the most reliable signal: the backup has real gaps | You do a test restore — you recover a few files from the backup into another folder or onto another device — and compare | Work out which folders or periods are missing and fix the settings before anything else |
| Files that restore but will not open | The copies exist but are damaged or incomplete | An unreadable backup is, in practice, the same as having none | During the test restore, photos or documents show an error when you open them | Check the storage (drive or service) and copy the affected files again |
| “Storage full” notifications you ignored | The service warned you, perhaps several times, and the alert got lost among other notifications | From that point on, in all likelihood, new files are not protected | You find the message among your archived emails or notifications | Treat the alert as an indicator, not as advertising: check how much space is actually used |
| The external drive has been in a drawer for months | The copy on the drive has not been updated for a long time | An old copy only protects old files | You cannot remember the last time you plugged it in | Plug it in, update the backup and set a reminder |
| A deleted file has vanished from the copy too | You deleted something on your phone and cannot find it in the cloud either | You are using syncing, not a backup with versions: the deletion spreads | You look for a file you deleted by mistake and the service’s bin is empty | Recover what you can from the bin; then consider an independent copy that keeps versions |
| You cannot remember the password for an encrypted backup | The copy exists and is protected, but the key to open it is no longer available | An encrypted copy (made unreadable without the correct password) that you cannot open is lost to you as well | The program asks for the password and none of the ones you try works | If the backup can still be redone, create a new one with a password you store safely |
| File names or extensions changed in the copy | The files in the backup have strange names or all stop opening at once | It may mean that malicious software has made the files unreadable and that the change has reached the copy too | Scrolling through the backup, you notice files renamed in bulk | Disconnect the drive or pause syncing straight away and do not overwrite anything; the mechanism is explained in the post on ransomware and personal files |
A concrete example
Sarah changes phones in September. While setting up the new one, she chooses to restore everything from the backup: contacts, apps, photos. An hour later the new phone is ready and looks just like the old one.
That evening, looking for her photos from the August holidays, she notices that the gallery stops in March.
In March, her free cloud storage had filled up. The service had warned her with a notification, which Sarah had mistaken for yet another offer of paid storage. From that day on, the backup had stayed switched on, but it had not copied a thing.
This time things turned out well: the old phone was still in a drawer, with the photos on it. Had she lost it — the scenario told in the post on a lost phone without a backup — six months of memories would have gone.
The first signal was already enough. Read as advertising, it was ignored; read as an indicator, it would have led to a two-minute check on the date of the last backup.
What to check right away
On your phone
- the date and time of the last completed backup;
- the conditions it needs to start (Wi-Fi, charging, battery saver);
- what is included: photos, videos, documents, messages.
On your cloud service
- the space used and the space available;
- the list of sync errors, if there is one;
- how long deleted files and previous versions stay available;
- that access to the account is protected by a strong password and multi-factor authentication (a second check, such as a code on your phone, on top of the password).
On your external drive or computer
- the date of the last copy;
- that the drive is recognised without errors;
- that the password for the encrypted backup is stored and can be recovered.
On the files that matter most to you
- a test restore of a few important photos and documents, even if you have seen no signals.
If you find a suspicious indicator
- Do not delete anything from the original device. Until the backup has been checked, the original is the only copy you can be sure of.
- Put your most precious files somewhere safe straight away, even with a manual copy on another device or drive: it is temporary, but it reduces the risk while you sort out the rest.
- Fix the cause: free up or add space, sign back in to the account, change the start conditions, include the missing folders.
- Run a full backup and check that it finishes, making sure the last backup date updates.
- Do a test restore of a few recent files: it is the only way to know the problem is really solved.
The method for building copies that do not depend on a single point — three copies, two types of storage, one away from home — is explained in the post on the 3-2-1 backup rule.
What is not an indicator
Telling the difference helps you avoid two opposite mistakes: getting alarmed over nothing, and getting used to ignoring the real signals.
| Situation | Why it is usually not a signal |
|---|---|
| A backup “waiting” for a few hours | Many backups run overnight or only on Wi-Fi: a short delay is normal; it only counts if the date stays frozen for days |
| Photos shown at reduced quality on your phone | With storage optimisation, the phone keeps lightweight previews and leaves the originals in the cloud; it is not a fault, but it does mean there is only one full copy |
| An offer to buy more storage | It is a sales message, not a “storage full” warning; look at the space actually used before drawing conclusions |
| A slower backup after a system update | After a major update the system may re-check many files; it only counts if the backup does not finish over the following days |
The rule of thumb: a frozen date deserves a check; a test restore that fails deserves action.
How often to check
You do not need a demanding routine. You just need one to exist.
| Frequency | What to check |
|---|---|
| Whenever a notification arrives | Read the storage or error alert and check the last backup date straight away |
| Every month | The last backup date on your phone and computer; space available in the cloud; updating the copy on your external drive |
| Every 3 months | A test restore of a few photos, a video and an important document |
| Every 6 months | That the copies on the drive can still be read; that the backup password is still available; which folders are included |
| When you change phones, accounts or passwords, or after a major update | That the backup is linked to the right account with the same settings, and that the next copy is complete |
A monthly and a quarterly reminder work better than any good intention: a regular check only holds up if it does not depend on remembering it.
Two important warnings
An indicator is not proof. A date that has not moved for two days may simply mean your phone has not been charging with Wi-Fi on. A file that will not open may be down to the program you are using to open it, not the copy. Check before you worry — but always check.
No indicators is not a guarantee. A backup can report “completed” and still have gaps: excluded folders, damaged files, versions that were not kept. That is why the most reliable check is not reading the status, but trying to recover something. And protection does not rest on watching for signals, but on preventive measures: several copies on different types of storage, a trustworthy service, strong passwords and encryption, explained in the recommendation on encrypting your personal devices.
How this connects to the Cyber Welfare Framework
| Pillar | What this content contributes |
|---|---|
| Skills | Knowing how to read a backup’s status, interpret dates, storage and errors, and carry out a test restore |
| Awareness | Understanding that an active backup is not necessarily a working backup, and that syncing is not the same as keeping a copy |
| Secure Behaviour | Checking your copies regularly, without waiting for the day you need them |
Reference level: FL3 — Autonomous. This is the level at which you recognise a signal and act on it without needing outside support.
Conclusion
The signs your backup is not working are not meant to make you look at your copies with suspicion. They are meant for the opposite: knowing where to look, every now and then, so that you do not discover a problem at the very moment you need your files.
What to do right now. Open the backup settings on your phone and look at the date of the last completed copy. Then try to recover a photo from a few months ago on another device. If something does not add up, you have just gained valuable time. If everything looks fine, you can repeat the check in a month. To see where you stand on the other aspects of your digital security, you can take the digital resilience self-assessment.
Related resources
Short deep dives from the Resources section, for anyone who wants to focus on a single aspect:
- Data Backup: The Only Protection That Works Afterwards
- Data Encryption: Already On, and Worth Understanding
Related content
- Backing up photos and videos — the recommendation this belongs to
- Ransomware and personal files — the threats that put your backup to the test
- 3-2-1 backup rule — how to build copies that hold up, in the right order
- Cloud or external drive backup — the tools and how to choose between them
- Losing personal files — what is lost when a signal is confirmed too late
Start with the first step: the Cyber Welfare Programme guides you free of charge, one recommendation at a time.
