Git move all untracked files and folders to directory out of git?

I got PC from previous developer. There are many untracked files and folders (>400) in git. Project should work without them, but I don't want to delete or stash them. Maybe I'll have some usage later.

Is there way to move them with structure to Backup folder out of git?

From Mark Longair's answer to How to make quick backup of untracked files which I want to delete by git clean?:

The following command will create a tar archive in your home directory of all of the untracked (and not ignored) files in your directory:

git ls-files --others --exclude-standard -z | xargs -0 tar rvf ~/backup-untracked.tar

If you're going to use this technique, check carefully that git ls-files --others --exclude-standard on its own produces the list of files you expect!

A few notes on this solution might be in order:

• I've used -z to get git ls-files to output the list of files with NUL (a zero byte) as the separator between files, and the -0 parameter to xargs tells it to consider NUL to be the separator between the parameters it reads from standard input. This is a standard trick to deal with the possibility that a filename might contain a newline, since the only two bytes that aren't allowed in filenames on Linux are NUL and /.
• If you have a huge number of untracked files then xargs will run the tar command more than once, so it's important that I've told tar to append files (r) rather than create a new archive (c), otherwise the later invocations of tar will overwrite the archive created just before.