Modern smartphones like the Xiaomi Redmi 9 have powerful hardware, but over time they accumulate gigabytes of digital garbage. This is an inevitable process: apps grow in size, browsers store tons of temporary data, and instant messengers duplicate the received photos and videos in the gallery. The user notices that the interface begins to slow down, and notifications of space shortages appear more often, blocking the ability to take a new picture or install an important update.
Cleaning up is not just about removing redundant files, it’s a comprehensive approach to maintaining the Android operating system with the MIUI shell. In this article, we’ll explore safe ways to free up space that don’t require superuser rights or complex code manipulations. You’ll learn to distinguish system files from user debris and use built-in cleaning tools as efficiently as possible.
Ignoring overcrowded storage can lead to serious performance problems. When free memory becomes critically scarce, the system can’t work properly with virtual memory, causing freezes and spontaneous reboots. Regular maintenance of your Redmi 9 will extend its life and keep it running at the level of the first day of use.
Analysis of occupied space and search for hidden volume files
Before you start deleting, you need to understand what exactly takes up space. Xiaomi standard tools provide basic information, but for deep analysis, you better use specialized utilities or built-in storage analyzer. Often it turns out that the lion’s share is not photos, but the cache of messengers like Telegram or WhatsApp, which can grow to tens of gigabytes.
Go to the settings and find the storage section, and you'll see the data distribution visualization here. Notice the "Other" category, which is the most mysterious section, where the remnants of deleted applications, error logs and temporary update files are often hidden, and it takes care to securely delete them so that important data is not erased.
- 🔍 Application cache – temporary files that speed up programs, but often take up to 40% of memory.
- 📸 Media content – photos and videos, including deleted ones, that are still in the gallery basket.
- 📥 Downloads - installation files APK, PDF-Documents and archives forgotten after downloading.
- 💬 Messenger databases – history of correspondence and transferred files that are duplicated in the phone memory.
⚠️ Note: Before mass deletion of files from the folder Android/data Make sure to back up important documents or system directories. Mistakes to delete system configs can cause some applications to malfunction.
Use of the built-in "Security" application
Each Xiaomi smartphone has a Security system app preinstalled, which includes a powerful Cleanup tool, the first line of defense against digital trash. The algorithm scans the file system for temporary files, installer residues, and advertising debris, and it is recommended to run this procedure regularly, at least once a week.
When working with cleaning, the system will suggest removing files that it considers safe to delete. However, be careful: sometimes important screenshots or documents are included in the list. Deep Cleaning allows you to analyze large files and duplicates in more detail, giving the user a choice.
Don't just rely on automatic mode. Big Files often includes forgotten movies or archives that you're no longer using. Manually checking this list allows you to free up gigabytes of space in a few minutes. Also look at the Apps tab inside the cleaner, where you can quickly reset the cache of heavy programs.
☑️ Checklist for quick cleaning
Clearing the cache and data messengers
Messengers are the main memory eaters on Redmi 9. Telegram, Viber and WhatsApp store every open image and video in cache, even if you just browse them in the channel and forget it. Over time, this cache turns into a huge data dump, which is not necessary for the application to work, but takes up space.
Cleaning is better done through the settings of the app itself, not through the File Manager. Telegram, for example, has a great Memory Use feature where you can set up automatic cache cleanup 3 days or a week after viewing, a critical setup that will prevent future overflow problems.
On WhatsApp, it's more complicated: you go to the settings, you select Storage, and you manually select the chat rooms that take up the most space. Often users store years of correspondence with media files that can be safely deleted while preserving a text history. Deleting media files from the chat does not delete the text of the message itself.
| Annex | The path to cleanup | Is it safe to remove? | Impact on data |
|---|---|---|---|
| Telegram | Settings → Data and memory → Memory use | Yeah, totally. | Files will be deleted from the cache, but will remain in the cloud |
| Settings → Storage → Storage Management | Selectively | Remove media from chat rooms, text will remain | |
| Viber | More. → Settings → Memory. → Clear the cache | Yes. | Delete temporary files, media will be saved in the gallery |
| Phone settings → Apps → Instagram → Memory | Yes (Cash) | Delete temporary data, login to the account will remain |
Why is the messenger cache growing so fast?
Removing duplicate photos and videos in the Gallery
Xiaomi Redmi 9 camera takes high-quality pictures, but files take up a lot of space. Often users take a series of identical frames to choose the best one, forgetting to delete the defect, and when synchronizing with cloud services or transferring data, you can create copies of files with the inscriptions "(1)", "(2)" at the end of the title.
MIUI has a built-in duplicate search tool that analyzes not only file names but also their contents, finding the same images even with different names, and using this tool allows you to safely delete copies, leaving the originals in the best quality.
It's also worth checking the folder "Recently deleted." The files you erased can lie there for up to 30 days, taking up precious space. Cleaning this folder is the fastest way to make room instantly. Don't forget to also check the folders of screenshots and screen recordings, which are often duplicated when editing.
- 🖼️ Serial shooting – check the Camera folder for series of identical photos.
- 📹 Video 1080p/60fps — Long videos take up a lot of space, consider archiving them on PC.
- 📸 Portrait mode – sometimes saves both source and blur photo, check whether you need to store both.
- 📂 Hidden Albums – Don’t forget to clean up Closed Albums if they’re no longer needed.
⚠️ Note: When removing duplicates, make sure you do not erase the originals of important documents or scans that may have been accidentally duplicated during synchronization.
💡
Tip: Set up Google Photos’ “Free Space” feature, which will automatically remove photos and videos that have already been successfully uploaded to the Google cloud, keeping them available online in the gallery.
Working with Download folder and APK files
The Download folder is a black hole where all the files from the Internet are flowing, and browsers by default store everything you download, from pictures to application installation files (APKs), and over time, it accumulates many installers that have already performed their function and are no longer needed.
Removal APK-The files are safe if the application is already installed and running. Often users download the new version of the program on top of the old one, and the old installation file remains dead weight. Also in this folder are often files with the extension.tmp or.log, which are the trace of the work of various utilities.
It's recommended that you open the file manager once a month, go to the Downloads category, and sort files by date. Anything older than a month and not an important document can be safely sent to the trash, a simple habit that keeps your phone clean.
Manual check path:
File Manager → Internal Memory → Download
(or MIUI → Download)Reset application settings and clean up system debris
Sometimes, standard cleaning doesn't work, and the system keeps reporting space shortages, and in these cases, resetting specific "heavy" applications like browsers (Chrome, Mi Browser) or social networks (VK, TikTok) helps, and these applications cache a huge number of videos and web pages.
To do a deep cleanup, go to Settings → Apps → All apps. Select the app you want, click Memory and select Clear (or Clear Cache and Clear All Data). It’s important to understand the difference: Clearing the cache is safe, and cleaning all data will reset the app to a post-installed state, which will require re-entering the account.
For system debris that is not visible to conventional means, you can use developer mode, but this requires caution.However, in most cases, it is enough for Redmi 9 to simply reboot the phone to Safe Mode so that some background processes will terminate and release temporary files, and then restart back.
💡
The most effective way to deal with system debris is to reboot the device regularly (at least once every 3-4 days), which forcibly closes the background processes and clears the RAM.