Can I delete files once I compress them into a zip file?

I am trying to get more space in my hard drive. One of the suggestions is to compress files I don't use. Once I compress them into an archive zip file, it looks like the files are still there.  I'm thinking that I should delete the original files but am afraid to do so. What percentage space do I save when I compress?

What percentage space do I save when I compress?
That depends on the type of file. Files that are already compressed, such as most media files, won't get smaller, and they may get larger. Text files will compress by about half, on average, but that will probably save a negligible amount of space.
The right solution to your problem is to move the files you don't often need to an external hard drive. That drive must be backed up along with the internal one.

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