Redmi series smartphones are famous for their excellent value for money, but budget models such as Xiaomi Redmi 9C often face a lack of built-in storage. When internal memory fills up, the device starts to work slower, applications fly out, and new photos stop being saved. It is a natural process that requires periodic maintenance of the gadget.
The user needs to understand that the MIUI operating system accumulates a lot of temporary files that eventually turn into digital garbage. In this article, we will discuss proven methods that will help you return the phone to performance and free up gigabytes of free space without losing important data.
Operational intervention in the structure of files allows you to extend the comfortable use of the smartphone, you will learn how to safely remove excess and which system functions should be activated first to optimize the work of the data warehouse.
Analysis of vault occupancy
Before you start taking drastic measures, it's important to understand exactly what's taking up space in your phone. Android provides built-in tools to visualize disk usage, making it much easier to diagnose. Without this step, you can delete unnecessary files while the main memory eaters remain intact.
To start your analysis, go to Settings → About Phone → Storage. Here you will see a color diagram that shows apps, images, video, audio and system files in different shades. Notice the “Other” category, which often hides the messenger cache and remnants of remote programs.
- 📱 Applications and their data usually occupy the largest volume after media files.
- 📸 Gallery can grow to tens of gigabytes if saving photos in their original quality is enabled.
- 🗑️ The shopping cart in the gallery often stores deleted files for up to 30 days, continuing the memory.
The system analyzer will show an approximate amount of free space, but does not always detail the contents of folders. To better understand the processes, you should use third-party utilities or file managers with analytics, which will allow you to identify hidden duplicates and forgotten downloads.
Use of the built-in "Security" application
The MIUI shell is equipped with a powerful pre-installed tool to maintain the system. The Security app can find temporary files, installer residues and advertising debris that accumulates in the background. This is the safest way to clean up for inexperienced users, since algorithms prevent the removal of systemically important components.
Run the Security app and select Clean up. The system will automatically scan the device and prompt you to delete files that are not needed for stable operation. It is important to look carefully at the list before confirming so as not to accidentally erase saved passwords or game progress if they are marked as cache.
⚠️ Attention: Acceleration in the same menu closes the background processes, freeing up RAM, but does not affect storage capacity. RAM No room for new photos.
Regular use of the built-in scanner helps keep the phone on track, but it's worth remembering that this method will not completely clean the system of garbage from this method, because deep traces of application activity require manual intervention.
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The built-in MIUI cleaner is safe for system files, but can skip large files in the Download folder that need to be manually deleted.
Manual cleaning of cache and application data
Social networks and instant messengers are often the most voracious elements in a smartphone. Telegram, WhatsApp, Viber and TikTok store every photo and video viewed in cache, which can reach 5-10 gigabytes over time. Clearing this data through system settings is the most effective method of freeing up space.
Go to Settings → Applications → All Apps. In the list that opens, sort programs by memory size. Select a heavy app, click Memory and then Clear Cache. This operation is safe and won’t delete your correspondence or account, unlike the Clear Data button.
For instant messengers, it is better to use built-in cleaning features, as they allow selectively delete media files. For example, on Telegram you can set up automatic deletion of the cache after 3 days or a week, which eliminates the need to do this manually.
☑️ Checklist of cleaning messengers
Special attention should be paid to the Chrome browser or MIUI Browser, which saves pages for offline access and pictures from visited sites. Clearing the history and cache of the browser can instantly release several hundred megabytes, which is critical for the Redmi 9C with a small amount of built-in storage.
Working with files and download folder
Download is a black hole where all the files, APK installers, documents and forgotten images that are downloaded from the Internet are flocked, and users often forget about the contents of the directory, allowing it to grow for years, and manually reviewing this folder can return up to 20% of free memory.
Use the standard Files Explorer or the more advanced Total Commander. Follow the Internal Shared Drive → Download. Here you will find everything you have ever downloaded. Delete old versions of apps, PDF promotional booklets and unnecessary installation files.
| File type | Expansion | Can I remove it? | Recommendation |
|---|---|---|---|
| Application installer | .apk | Yes, if the app is installed | Remove immediately after installation |
| Temporary file | .tmp | Yes. | Safe removal |
| Document | .pdf,.doc | If necessary, | Check the contents |
| Archives | .zip,.rar | If unpacked | Remove after unpacking |
Remember to check the Bluetooth folder if you've ever taken files over the air. Also, at the root of the internal storage, there are often folders from remote applications that continue to store logs and settings. If you're sure that the program is deleted, its folder can be erased.
What is an Android/data folder?
Gallery optimization and cloud services
Media files are the biggest enemy of free memory. Modern cameras take detailed pictures that weigh a lot. If you don't want to delete memorable photos, use cloud storage. Google Photos or Mi Cloud allows you to upload originals to the Internet and free up space on your device with a single button.
Google Photos has a Free Space feature that finds copies of photos and videos that have already been successfully uploaded to the cloud on your phone and deletes them locally, which is a safe method because the photos will remain online even if they are deleted from your phone.
If you have a model with a small amount of memory (32 or 64 GB), it makes sense to reduce the quality of video recording from 4K or 1080p to 720p, if you do not plan to display photos on large screens, this will significantly reduce the size of each file.
⚠️ Before deleting the original photos, make sure that the sync with the cloud is complete. Check for photos in the cloud through the browser on your computer, so that you do not lose important moments forever.
For users of the Xiaomi ecosystem, synchronization with Mi Cloud is convenient. With storage optimization enabled, the original remains in the cloud, and a smaller copy on the phone that takes up minimal space, which is the perfect balance for budget smartphones.
Removal of duplicates and hidden debris
When you use your smartphone, you inevitably have duplicate files in your memory, which can be the same photos taken in a series, or copies of documents saved from different messengers, and it's hard to find them manually, so you'd better use specialized utilities like Files by Google or a built-in analyzer.
Duplicate search apps scan hash sums of files, finding exactly identical copies, even if they are called differently. By deleting them, you can safely return several gigabytes. However, be careful with similar but not identical photos - the algorithm can count them as duplicates.
You should also look at the.thumbnails folder in the DCIM directory, which stores thumbnails of your photos for quick viewing in the gallery. Sometimes this hidden folder can be as big as 1-2 GB. It can be cleaned, but the system will create it again the next time you open the gallery.
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To temporarily prohibit the system from creating new thumbnails and save space, you can rename the folder.thumbnails in the new folder.thumbnails_block And then we can create a file with the same name instead, and that'll stop the cache from growing.
Regular duplicate checks should become a habit, run scans once a month and delete the copies you find, which will help keep the system clean without having to be urgently cleaned before important events.