How can I copy a directory and rename it in the same command?

You should be able to do just

cp -R /tf/Custom_App /tf/Custom_App_backups/Custom_App_2017-12-21

However, if the target directory already exists, this would append the final part of the source path to the destination path, creating /tf/Custom_App_backups/Custom_App_2017-12-21/Custom_App, and then copy the rest of the tree within that.

To prevent this, use /tf/Custom_App/. as the source. Of course, in that case you might want to rm -r /tf/Custom_App_backups/Custom_App_2017-12-21 first, if you don't want older files lying around there after the copy.

The difference between /some/dir and /some/dir/. was discussed a while back in cp behaves weirdly when . (dot) or .. (dot dot) are the source directory

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Cp