What is in Application Caches (user) and also in CloudKit? It asks me everyday to delete them as unnecessary.
Would like to understand what’s in them so I don’t accidentally delete something that was impt. to save.
Hello @Patricia_T_Chiota
Application Caches (user) and CloudKit data are categories of storage on Apple devices (macOS, iOS, iPadOS) that hold temporary or synchronized information to improve performance and keep your apps updated across devices.
Application Caches (User)
The user application cache refers to temporary files created and stored by the apps you use on your device.
- Purpose: These files allow apps to load faster by storing frequently used data—like images, web scripts, or map tiles—locally so they don’t have to be re-downloaded from the internet every time you open the app.
- Location: On a Mac, these are typically found in
~/Library/Caches. - Management: While these files are intended to be temporary and the system may delete them to free up space, they can sometimes grow very large. Manually clearing them is generally safe as apps will simply recreate them when needed, though this may temporarily slow down initial app performance.
CloudKit Data
CloudKit is the backend framework Apple uses to sync data for its own apps (like Photos, Notes, and iCloud Drive) and third-party apps across your devices.
- Purpose: It moves data between your local device and iCloud containers to ensure that a change made on your iPhone appears instantly on your Mac.
- CloudKit Caches: To keep this sync seamless, your device stores “CloudKit data” locally in hidden cache folders. This includes metadata, database mirrors, and “Assets” (like photo thumbnails or file fragments) that are in the process of being uploaded or downloaded.
- Storage Issues: Users often notice “CloudKit” consuming massive amounts of “System Data” (formerly “Other” storage). This bloat often occurs when syncing large photo libraries or many files in iCloud Drive.
- Management: CloudKit is designed to manage its own space automatically. If it becomes excessively large, it is often due to an interrupted sync; restarting the device or toggling iCloud settings for the specific app usually fixes it.
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Deleting Application Caches (user) and CloudKit data is generally safe, as these are temporary files designed to speed up your device, not your actual personal documents or photos. However, clearing them will temporarily slow down related apps while they rebuild these files, and it may trigger large data redownloads if you use iCloud services.
Application Caches (User)
These are temporary files stored locally on your device by the apps you use.
- What’s inside: Images, scripts, and multimedia files (like album art in Spotify or web elements in Safari) that the app downloads so it doesn’t have to fetch them from the internet every time you open it.
- Is it important? No. If you delete them, the app will simply recreate or redownload them the next time they are needed.
- Risk: Deleting them while an app is running can cause that app to crash. Always quit apps before clearing their specific cache.
CloudKit
CloudKit is Apple’s framework that apps use to sync data (like notes, calendars, or app settings) across your devices via iCloud.
- What’s inside: Local “shadow” copies of data that is already stored in the cloud. This includes record metadata, change tokens, and cached versions of files like photos or documents to enable offline access.
- Is it important? The master copy of your data lives on Apple’s servers. The local CloudKit cache is just for convenience and syncing.
- Risk: Deleting CloudKit caches can occasionally fix “stuck” sync issues, but it may also force your device to perform a massive download to resync everything from iCloud, which can consume significant bandwidth and battery.
Why are you asked to delete them every day?
If you are receiving daily prompts, it is likely due to one of the following:
- Low Disk Space: Your Mac or iPhone is critically low on storage, and macOS is automatically trying to “purge” these discardable files to keep the system running.
- Third-Party Cleaning Apps: Tools like CleanMyMac or similar “optimizing” software often flag these as “junk” to show they are “cleaning” your system, even if the files are performing their intended job.
- Sync Errors: If a specific CloudKit sync is failing, the system may repeatedly attempt to clear and rebuild the cache.
Recommendation: Unless your disk is almost full or an app is behaving strangely, you can safely ignore these prompts. Caches are a healthy part of a fast system.
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CleanMyMac, Application Caches (user) refers to temporary files stored by your apps to speed up performance, while CloudKit data typically refers to locally cached versions of files and assets synced with Apple’s iCloud.
Key Differences and Safety
- Application Caches (user): These are non-essential files created by your apps (located in
~/Library/Caches) to help them load faster. Deleting them is generally safe; the only downside is that apps may be slightly slower the next time you open them as they rebuild these files. - CloudKit Data: This is a specific type of cache used by macOS to manage data synced through iCloud (like Photos or Cloud Drive).
- Function: It acts as a local bridge for cloud-stored assets.
- Cleanup: While CleanMyMac may identify large CloudKit-related folders (such as
com.apple.bird), macOS is designed to manage this space automatically, deleting it only when disk space is low. - Risk: Manually or forcefully deleting massive CloudKit caches can trigger a large background download as your Mac immediately attempts to re-sync that data from the cloud, which can consume significant bandwidth and CPU.
Recommendations
- Use Smart Scan: CleanMyMac’s Smart Scan is programmed to avoid deleting vital system files.
- Review Before Cleaning: If you see a massive amount of “CloudKit” or “User Cache” data, click Review Details in CleanMyMac to see which specific apps are responsible.
- Backup First: It is always recommended to have a Time Machine backup before running deep system cleanups.
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Smart Scan is the central “all-in-one” feature of CleanMyMac (by MacPaw), designed to optimize your Mac through a single click. It acts as a combined dashboard that triggers several scanning routines simultaneously to assess your device’s health, security, and performance.
Core Functions of Smart Scan
When you run a Smart Scan, the app executes the following modules in one pass:
- Cleanup: Identifies unneeded “system junk,” such as old caches, logs, broken downloads, and unnecessary email attachments.
- Protection: Scans for malware, including viruses, adware, and keyloggers, powered by the Moonlock engine.
- Performance (Speed): Suggests optimizations to speed up the system, such as freeing up RAM, flushing the DNS cache, and managing heavy background processes.
- Applications & Updates: (In newer versions like CleanMyMac 5) It can also check for pending application updates or highlight apps that haven’t been used in months.
Key Benefits & Usage
- Speed: The scan typically completes in under two minutes, even on older systems.
- Control: Users can review every suggested deletion or optimization before committing to any changes.
- Safety : The tool is designed to avoid deleting critical system files and is notarized by Apple for security.
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AI sourced content may make mistakes
Caveat: I’m not Mac
While Norton 360 and CleanMyMac are popular, running them simultaneously is generally not recommended as they can conflict, consume excessive system resources, and cause performance instability.
Norton 360’s Built-in Cleaning Tools
If you already have Norton 360, you may not need a separate cleaner. It includes a File Cleanup tool designed to remove junk files, temporary data, and cache.
- How to run a scan:
- Open your Norton device security product.
- In the left pane, click Performance.
- Find the File Cleanup tile and click Open.
- In the Files tab, click Check Now to scan for junk.
- Review the summary and click Clean selected junk to remove files.
- Automation: You can schedule these scans (daily, weekly, or monthly) via the Settings tab within the File Cleanup menu.
- Recovery: Deleted files are moved to your Trash/Bin by default, allowing for manual retrieval if needed.
Norton Utilities Ultimate vs. CleanMyMac
For more advanced cleaning, Norton offers Norton Utilities Ultimate, which provides deeper system optimization than the standard Norton 360 suite.
| Feature | CleanMyMac X | Norton 360 / Utilities |
|---|---|---|
| Primary Focus | System cleaning & optimization | Comprehensive security & antivirus |
| Malware | Scans for Mac-specific threats | Top-rated real-time protection |
| Cleanup | Deep junk & large file removal | Basic file & browser cleanup |
| Conflicts | May conflict with other AV software | May conflict with other cleaners |
Expert & Community Advice
- Redundancy: Many Apple community experts argue that macOS’s built-in tools (like XProtect) and manual maintenance are safer than third-party cleaners, which can sometimes mistakenly remove essential system files.
- Performance: Both apps can be resource-heavy. If your Mac is slow, try using the built-in Storage Management tool in System Settings > General > Storage before installing additional software.
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AI Overview
It is generally not recommended to run CleanMyMac and Norton 360 simultaneously on a Mac, as they can potentially conflict and cause performance issues or even system instability. While both offer features like system cleaning and malware protection, macOS already includes built-in security features.
Why it’s not recommended:
- Resource conflicts:
Both CleanMyMac and Norton 360 can consume significant system resources, potentially leading to slowdowns and decreased performance. - Potential for conflicts:
Cleaning and optimization tools can sometimes interfere with macOS’s built-in system processes, leading to errors or unexpected behavior. - Redundancy:
macOS has its own built-in malware protection XProtect, making dedicated antivirus software like Norton 360 potentially unnecessary. - False positives:
Cleaning and optimization tools might mistakenly identify necessary system files as junk, leading to potential data loss or instability.
Alternatives to consider:
- Rely on macOS’s built-in features:
macOS has built-in tools for managing storage and security, which are often sufficient for most users. - Use Malwarebytes for Mac
If you’re concerned about malware, Malwarebytes for Mac is a recommended tool for removing it. - Be cautious with downloads:
Stick to reputable sources for downloads and avoid clicking on suspicious links or attachments.
In conclusion: While neither CleanMyMac nor Norton 360 are inherently dangerous, running them simultaneously is generally not advised due to potential conflicts and the availability of macOS’s built-in security features. It’s often better to rely on macOS’s built-in tools and be mindful of your online activity to maintain a secure and performant system.
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- Learn more about Norton File Cleanup on Mac
- Optimize and improve the performance of your Mac using your Norton device security product
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AI sourced content may make mistakes
Caveat: I’m not Mac
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Hello @Patricia_T_Chiota
Care to share your progress