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Is sync -contacts backup to file Safe?

sync -contacts backup to file privacy label · by 泽辉 王 · checked November 2026

  • Nothing linked to you
  • Not updated in 2+ years
App Privacy label Developer-reported · checked November 1, 2026
Used to track you
0types

None declared

Linked to you
0types

None declared

Not linked to you
1type
Short answer

On the label it is low-risk: sync -contacts backup to file collects some data but says none of it is linked to you or used for tracking. None of it falls in Apple's most sensitive categories (health, financial, location, contacts or your own content). In total the label lists 1 data type; 33% of contacts backup apps we checked declare tracking.

At a glance

sync -contacts backup to file privacy in one look

Data exposure on the label
Not linked to you
  1. 1
  2. 2
  3. 3
  4. 4

Built only from the developer's App Store label. It describes disclosure, not tested behaviour.

Verdict from the label
Not linked to you

sync -contacts backup to file collects some data but says none of it is linked to your identity, and none is used for tracking.

Try it

Did sync -contacts backup to file ask for something?

Pick the permission prompt you saw. We compare it with what sync -contacts backup to file's developer declared.

It asked me for access to…
Tap a prompt to compare it with the label.
Not on the label

Location is not on sync -contacts backup to file's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Not on the label

User Content is not on sync -contacts backup to file's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Not on the label

Contacts is not on sync -contacts backup to file's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Not declared on the label

sync -contacts backup to file declares no tracking, so a tracking prompt would contradict its label. Decline it, and consider reporting the mismatch to Apple.

Not on the label

Health & Fitness is not on sync -contacts backup to file's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

A permission is what the app can reach on your iPhone; the label is what the developer says leaves it. They answer different questions.

Line by line

What sync -contacts backup to file collects, explained

Data typeWhat it coversWhere to limit it
IdentifiersNot linked to you An account ID, screen name, customer number or a device-level ID such as the advertising identifier. Settings › Privacy & Security › Tracking: turn off Allow Apps to Request to Track, or tap Ask App Not to Track when prompted.
Reading the label

What sync -contacts backup to file's label means for you

sync -contacts backup to file's label has 1 type under “Data Not Linked to You”. A data type can appear in more than one section when it is used for different purposes — for example, identifiers used for both analytics and advertising.

Every type on sync -contacts backup to file's label is in the “not linked” section, so the developer says the data is stripped of anything that identifies you before it is used. That is typical of anonymous analytics and crash reporting. Not linked is still collected: the data leaves your phone.

None of the data types fall into the categories most people consider sensitive: health, financial information, precise location, contacts, browsing history or the content you create.

Contacts backup apps upload your whole address book — other people's names, numbers and addresses, not just yours. Check where the backup is stored, whether it is encrypted, and how to delete it from the server.

Among the 126 contacts backup apps in our snapshot with a label, 33% declare tracking, 48% collect data linked to you and 33% say they collect nothing. sync -contacts backup to file lists 1 data type, fewer than the average of 2.2 for this group.

Utilities range from calculators to VPNs, so their labels vary more than any other category. A simple tool that collects identifiers and usage data for tracking is a sign of advertising SDKs.

On your iPhone

Settings to check for sync -contacts backup to file

  1. 1

    Tracking

    Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.

  2. 2

    Lock the app

    On iOS 18 and later, touch and hold the icon and choose Require Face ID. Anyone who picks up your unlocked phone then needs your face, fingerprint or passcode to open it.

  3. 3

    Notifications

    Settings › Notifications › sync -contacts backup to file › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Cross-app tracking

Does sync -contacts backup to file track you?

No tracking declared

There is no “Data Used to Track You” section on sync -contacts backup to file's label.

Does sync -contacts backup to file track you? Full answer and how to stop it →

iOS 18 and later

Lock sync -contacts backup to file behind Face ID

  1. Find sync -contacts backup to file on your Home Screen or in App Library.
  2. Touch and hold the icon until the quick-actions menu opens.
  3. Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
  4. Tap Require Face ID again to confirm. sync -contacts backup to file now asks for authentication every time it opens.

The lock is an iPhone feature, so it works whether or not sync -contacts backup to file has a passcode of its own. It does not change what the app sends to its developer.

From the App Store record

About sync -contacts backup to file

Developer泽辉 王
App Store categoryUtilities (also Productivity)
Latest version5.72, released February 2018
First releasedAugust 2014
RequiresiOS 8.0 or later
Size15 MB
Age rating4+
Languages3 (EN, ZH, ZH)
Bundle IDcom.wzh.emoji

The current version shipped in February 2018, 8 years before our snapshot. Apps that are not updated may not support newer iOS privacy controls, and an abandoned app will not get security fixes.

Read with care

What the label cannot tell you

  • A label is self-reported. Apple publishes the developer's answers and can reject apps that misrepresent them, but it does not independently verify what sync -contacts backup to file sends.
  • It does not say where data is stored, how long it is kept, whether it is encrypted, or which companies receive it. The privacy policy covers those points.
  • Optional data counts: if a feature lets you add something (a profile photo, a phone number), the type is listed even if you never use the feature.
  • Data handled only on your iPhone is not 'collected', so a no-collection label is compatible with an app that reads your files locally.
  • Third-party sign-in, payment processors and SDKs are supposed to be included, but a label can lag behind a new version.

The question to ask sync -contacts backup to file's developer: How do I delete my contacts from their server later?

How it compares

sync -contacts backup to file vs similar contacts backup apps

Data types listed on each App Store privacy label
Tracks youLinked to youNot linkedCollects nothing

Fewer types is not automatically safer: a cloud backup app has to collect your files to work. Compare like with like.

Checking another app?

Look up any of our apps in seconds, or put two labels side by side.

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All contacts backup apps → Who tracks you? A–Z → Apps that collect identifiers → Privacy label decoder →

Do it now

Your sync -contacts backup to file privacy checklist

Tick what you have done
Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

Quick quiz

True or false?

  1. Q1sync -contacts backup to file's privacy label says it uses data to track you.
    Right.
    Not quite.

    False: there is no Data Used to Track You section on sync -contacts backup to file's label.

  2. Q2Apple tests every app to confirm its privacy label is accurate.
    Right.
    Not quite.

    Labels are self-reported by developers. Apple can reject or remove apps that misrepresent practices, but it does not audit each label.

  3. Q3sync -contacts backup to file collects Identifiers.
    Right.
    Not quite.

    True: Identifiers appears on its label, in the Not Linked to You section.

  4. Q4Data “Not Linked to You” is never sent off your iPhone.
    Right.
    Not quite.

    It is collected and sent; the developer says it is de-identified rather than tied to your account or device.

  5. Q5Tapping “Ask App Not to Track” can stop an app from working.
    Right.
    Not quite.

    Apple's rules require apps to work the same whether or not you allow tracking.

Questions people ask

sync -contacts backup to file privacy FAQ

Is sync -contacts backup to file safe to use?
Based on its App Store privacy label, sync -contacts backup to file collects some data but says none of it is linked to your identity, and none is used for tracking. Whether that is acceptable depends on what you will store in it. The label is developer-reported, not an independent security test.
Does sync -contacts backup to file track you?
No. sync -contacts backup to file's label has no Data Used to Track You section.
What data does sync -contacts backup to file collect?
Identifiers. None of it is linked to your identity.
Who makes sync -contacts backup to file?
泽辉 王, according to the App Store. It was first released in August 2014 and the current version is 5.72.
Can I lock sync -contacts backup to file with Face ID?
On iOS 18 or later, touch and hold sync -contacts backup to file's icon and choose Require Face ID (or Touch ID / Passcode). This is an iPhone feature and works for most downloaded apps, whether or not the app has its own lock. If you don't see the option, update iOS.
How does sync -contacts backup to file compare with other contacts backup apps?
Across 126 contacts backup apps with labels in our snapshot, 33% declare tracking and 33% say they collect no data. sync -contacts backup to file lists 1 data type against an average of 2.2.
How do I delete my contacts from their server later?
The privacy label cannot answer that. Look for it in sync -contacts backup to file's privacy policy or support pages, linked from the App Store listing. Check where the backup is stored, whether it is encrypted, and how to delete it from the server.
How do I delete my data from sync -contacts backup to file?
Apps that let you create an account must also let you start account deletion from inside the app (an App Store rule since June 2022). Deleting the app from your iPhone alone does not delete data already sent to the developer.
Facts on this page come from sync -contacts backup to file on the App Store, as reported by the developer. Checked 2026-11-01. How we collect data · Report a correction