That does seem about right for system files.
Here's some tips for managing your memory.
Uninstalling unwanted applications to increase the amount of free internal memory
If the Uninstall option isn't available, the application can't be deleted. Most preinstalled applications can't be deleted as they are integrated in the operating system of your device. All applications that you have downloaded and installed from Google Play™ can be deleted.
To uninstall an application
- From your Home screen, tap the Application screen icon.
- Find and tap Settings > Apps.
- Tap the All tab.
- Scroll to the application that you want to uninstall, then tap it.
- Select Uninstall > OK.
Clearing the cache and the data of applications on a regular basis
Applications occupy an increasing amount of storage when they are in use. The occupied storage can be distinguished into:
- Cache. The cache is data which is stored so that future requests for that data can be served faster. Deleting the cache doesn't delete any user data stored in that applications. The application might need a bit longer to start up the next time. This is not perceivable in most cases.
- Data. The data of an application is the user-related part of an application. This can be highscores or saved games, account data in an application like Facebook™, or personal data like contacts in the Contacts applications. Deleting the data of an application might lead to an irretrievable loss of personal data stored in an application.
To delete the cache or the data of an application
- From your Home screen, tap the Application screen icon.
- Find and tap Settings > Apps.
- Tap the All tab.
- Scroll to the application that you want, then tap it.
- Select Clear cache to delete the cache of the application, or Clear data to delete all user data (including the cache) stored by the application.
Backing up data to different memory types
Generally, you should not save photos, videos and other personal content solely in the internal memory of your device. If something should happen with the hardware, or if the device is lost or stolen, the data stored in the device internal memory is gone forever.
You do not need to back up or make a copy of applications that you downloaded from Google Play™ (Play Store). They can normally be downloaded again if you have set up a Google™ account in your device. You can find the apps which you have purchased under My apps in Google Play™, so you will not need to either pay, or search, for them again.
