Is it safe to delete some folders and files inside the folder 'files'?

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Hello!
I have just updated my website to C5's last version and all it's ok.
But I have got only 500 Mb of hosting, and I having some space problems now.
The size of each folder is:
concrete 32 700 KB
config 12.0 KB
files 200 656 KB
jobs 4.00 KB
languages 184 KB
packages 880 KB
updates 40 568 KB

There is a lot of subfolders and files in the "files" main folder. The date of most of them is one o more years ago. And there is a "tmp" folder, sized 164 Mb, with some .zip files inside.
Would it be safe to delete his content?

Thanks.

frankysev
 
Mnkras replied on at Permalink Reply
Mnkras
only the tmp folder is safe to delete
frankysev replied on at Permalink Reply
frankysev
Hello. Thank you for your answer.
I have tried to delete some of the oldest files, but the system doesn't let me to do it. All them are write protected, and I can't even change the files attributes.