What does synchronization in Xiaomi phone and why it is needed

Xiaomi, Redmi and Poco smartphone owners often face notifications that “synchronization is on” or “failed to sync” — a process that many users perceive as a background process that is best left unchecked until it starts to drain battery or take up space in memory — but understanding what sync means is key to efficient data management and security of your device.

In essence, this process is a constant comparison and update of information between your phone and remote cloud storage servers. In the Xiaomi ecosystem, it is primarily Mi Cloud, but also closely related to your Google account. If you lose your phone or buy a new model, it is synchronization that allows you to recover all contacts, notes, photos and even desktop settings in a matter of minutes just by logging in to your account.

However, blind trust in automatic settings can lead to cloud overflow or, conversely, loss of important data if you accidentally turn off the desired option. In this article, we will discuss in detail what data should be synchronized necessarily, how to manage this process in the shell of MIUI or HyperOS, and how to avoid common errors when changing devices.

The basic principle of cloud synchronization

Technically, the data exchange process is a periodic check of changes in the local databases of a smartphone and their matching with information on the server. When you add a new contact to the phone book, the system marks it as modified and, if you have an Internet connection, sends a copy to the cloud, which provides real-time backup, which is critical in case of sudden hardware failures.

It's important to understand the difference between a full copy and a sample one. It doesn't copy the entire phone every minute, because it would require a lot of traffic, instead it uses a delta synchronization algorithm that only transmits modified file fragments, and this is especially true for large amounts of data, such as a photo gallery or a message history in messengers.

⚠️ Note: Sync is not a replacement for a full backup with an external medium.If your account is hacked or blocked, you may lose access to all data stored exclusively in the cloud without a local copy.

The service requires a stable Internet connection, and you can specify in your settings whether you only use Wi-Fi or allow data to be transmitted over a mobile network, the latter option can lead to a rapid exhaustion of the data plan if you take many high-resolution photos.

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Configure synchronization of photos only via Wi-Fi, so as not to waste mobile traffic. This can be done in the settings Mi Cloud -> Gallery.

Main services and accounts in MIUI and HyperOS

Xiaomi smartphones have two main user profiles running in parallel: a Mi Account and a Google account. Each of them is responsible for its own data segment, and it is not necessary to confuse them. Mi Account is tailored to the manufacturer's ecosystem and allows you to synchronize specific data, such as theme settings, alarm clock schedules and the location of icons on the desktop.

Google accounts, in turn, are the standard for Android, which saves contacts, calendar events, Google Keep notes, and game progress, and separates these data streams, allowing users to manage privacy flexibly, such as storing personal photos in the Google cloud and working documents in the Mi Cloud.

To access the settings, go to Settings → Mi Account or Settings → Google → Sync. This displays the connection status and list of applications that have access to the background data transfer. Disabling sync for a particular application does not delete the data already downloaded, but stops updating it on new devices.

• 📱 Mi Cloud: Contacts, Messages (SMS/MMS), notes, voice recorder, alarm clocks, Wi-Fi settings, gallery.
• 📧 Google Sync: Contacts, calendar, Gmail, Keep notes, game progress, Chrome passwords.
• 📷 Third-party services: Photos Google, Yandex.Disk, Dropbox (requires separate settings within applications).
• 🔒 Security: Two-factor authentication and device search only work with an active account.

What exactly is preserved: a detailed analysis of categories

Users are often surprised to find that some data is lost after resetting, which is because not all categories are synced by default. For example, a gallery can only be set to download when connected to a charger, and messages may not sync if you didn't give the appropriate permission when you first set up the phone.

Special attention should be paid to the Notes section. In the MIUI shell, the standard Notes app syncs through Mi Account. If you create an important entry and do not log in to your account, this information will be lost when you move to a new phone. Similar to the situation with a recorder: records often take up a lot of space and by default may not be uploaded to the cloud.

Below is a table showing what data is stored and how critical it is to store it:

It’s worth noting that synchronizing apps only keeps a list of them: the program files themselves and, more importantly, their data (save in games, logins in banks) are often not automatically transferred, which requires the use of Google One or Xiaomi’s built-in Mi Mover tool.

Storage management and Mi Cloud limits

Xiaomi’s free cloud storage plan provides just 5GB of space. For modern high-resolution smartphones, this volume is catastrophically short even for a week of active shooting. So the system prioritizes data: contacts and settings are synchronized first, and photos can stop if the limit is exhausted.

To control the filling, you need to check the status of the storage regularly. Path to check: Settings → Mi Account → Mi Cloud → Storage Management. Here you will see a diagram of the space allocation. Often it turns out that most of the old backups of the recorder or video screen that the user has forgotten about.

If the limit is exceeded, the synchronization of new data is stopped until the space is freed or the subscription is paid, in which case the reminders will constantly hang on the lock screen and in the notification curtain, and you should not ignore them, since this means that your fresh photos do not have a copy on the server.

⚠️ Attention: Deleting photos from the Mi Cloud via a web interface or on another device will cause them to be deleted in your phone gallery if sync is enabled!

To save space, you can use the Storage Optimization feature, which replaces the original photos on your phone with smaller copies, leaving the full versions only in the cloud, which allows you to free up gigabytes on your device, keeping you able to view albums in good quality.

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5 GB of free space in the Mi Cloud fill up very quickly. It is recommended immediately after buying the phone to set up synchronization only contacts and settings, and send photos to Google Photos or to your computer.

Problems and conflicts in synchronization

Despite the fact that the processes are fine, Xiaomi users are periodically faced with errors, a common problem is “sticking” synchronization, when the indicator rotates indefinitely, but the data is not updated, this can be caused by a conflict of application versions, incorrect system shutdown or server-side problems.

Another common scenario is duplicate contacts, which happens if you sync contacts through the same time. SIM-You combine the map, Google and Mi Account, and you put them together, and you get dozens of identical records from different sources in the phone book» → setting → duplication.

To eliminate most errors, cleaning the sync services cache helps. This won't delete your data, but reset the connection settings. You can do this through the Settings menu → Apps → All Applications → Services and Feedback (or Mi Cloud) → Memory → Clear.

• 🔄 Network Error: Check if a firebrand or antivirus is blocking a connection to Xiaomi servers.
• 🔋 Energy saving: Aggressive battery settings can kill the synchronization process in the background.
• 📅 Wrong time: If the date on the phone is downed, a secure connection to the server will not be established.
• 🚫 Account Lock: When changing a password, you need to log in again on all devices.

How to properly disable or limit synchronization

Not all users need to be constantly on the cloud, some are worried about privacy, some want to save traffic or battery power, you can turn off sync completely or selectively for individual applications, a complete shutdown does not delete data from the phone, but stops backing it up.

To stop the process, go to Settings → Mi Account → Mi Cloud. Here you will see a list of all data categories with switches. Turning off the switch, the system will ask if you want to delete synchronized data from this device or leave it. Choosing “Delete” will clear the phone of cloud data, but save it on the server.

It's also important to set up autoboot. In the Gallery section inside the cloud settings, there's a "Supplies" option. If you turn it off, photos will only be taken to the cloud when you request them or when you connect to your computer, which gives you complete control over what leaves your smartphone.

⚠️ Warning: Before selling or transferring your phone to another person, make sure to log out of your Mi Account and Google account completely, otherwise the new owner will not be able to activate the device due to Activation Lock blocking).

To temporarily suspend the process, you can use the “Do Not Disturb” mode in the synchronization settings or simply turn off data transfer for specific applications in the Settings → Applications → Application Management → (Select the Application) → Traffic.