WinRAR is a powerful archive manager for Windows, Mac and Linux which can compress, encrypt, package and backup your files. It can backup your data and reduce the size of email attachments, open and unpack RAR, ZIP and other files downloaded from Internet, create new archives in RAR and ZIP file format.
Download & buy
You can try WinRAR before buy. Its single-user licence costs only $29. You can use the trial version for 40 days, after which you are expected to buy a license if you wish to continue using the application. However, it will continue to work after the trial days with a only reminder message to buy a license as penalty. Get trial version or purchase full version from its website here.