That doesn't sound right. I'm almost 100% sure that memory used for the OS isn't even displayed on the storage screen. It only shows you the breakdown from your available storage so makaroni is wrong on that one.
Chances are that you have something that is caching a large file on your phone. "cloudagent" is considered a miscellaneous file so it could be anything from files/pics linked throu your dropbox which are unfortunately still cached on your phone or if you use Google Play Music, the large size might be from music that's pinned to your device. My advice would be to use a file explorer and look through your cloudagent files. I have found old files and whole folders that were erased from my drop box yet were still cached in cloudagent. Just delete the ones you no longer need stored on your phone but make sure you only delete folders that are no longer in you dropbox or else they'll just reappear once cloudagent syncs with dropbox again.
Also I think some app data (depending on the app) is stored as miscellaneous. I think Snote notes and all the books in the library in my ereader app are also stored in Miscellaneous. Really your best bet is to get a file explorer and root around in the files. If you're not rooted then you won't have to worry about deleting OS files as you won't even have access to them. To be safe though only delete the files you put on the phone. Hope that helps.
i guess I stand corrected. In my phone when i first got it, there were some files already in there which I believed that they came pre loaded in the phone. Your answer sounds logical though because when I check mine now, there are some that weren't in there b4.
Sorry, I didn't mean to diminish what you said, but I have had similar problems on my S3 (nothing on my Note II) and using a file explorer really helped. I used to think it was system files so I just ignored it but then It became too large to ignore and I did some digging. I only use International phones though so you are correct that some of the data stored in Misc. might be from carrier bloatware but I don't want the OP to be scared to delete something because they thought it was a system file.
The best thing you can do is this (for Samsung users): You need at least One hour to do this job and during this period, you phone might not be allowed to use. It would be good if you have WiFi in your place. Once the procedure is complete, your mobile data will be activated during activation of your mobile and you might be charged otherwise. So, better to avoid this, you need WiFi.
If you want, you can note down your current memory state, which you can compare and get to know how much memory you saved post following below instructions.
1. Take complete backup of your phone using Kies. Google out if you don't know how to take backup. Link for Ref: What can I backup and recover from my device using Kies? : Cell Phones | Samsung
2. Do hard reset of your mobile. Link: Samsung i9100 Galaxy S2 hard reset - PDA Smartphone PNA hard reset soft reset
3. Now you need to activate your device. Follow instruction on your phone. During this you can disconnect your mobile from your PC/laptop.
4. Once setup is done, all the apps which were installed before will start installing from Google play automatically. If you don't want that, you can cancel the installation. Here , you need WiFi or mobile data connectivity. If you cancel the apps installing, you can get those installed may be later. All purchased apps prior in google play can be installed without paying again (I know you knew it !!)
5. Once installation of apps are done or if you cancelled, you can connect back to your PC again.
6. Now its time to restore. Follow the instruction in link: What can I backup and recover from my device using Kies? : Cell Phones | Samsung (you can select everything while restoring including miscellaneous files)
7. Now DONE.. check whats the memory you got back !! Bingo !!
Regards,
Shishir Hegde