Works with any cloud-based services, including Dropbox, Google Drive, OneDrive, ownCloud, Nextcloud and any other cloud storage service which synchronizes with a local directory.
It offers the best integration, ease of use and support with Ultimate and Enterprise editions of Microsoft's Windows Vista and Windows 7, and with the Pro and Enterprise editions of Windows 8.
As long as you have the password or keyfile to your encrypted file then you can still access it. This is beneficial if the software ever becomes unsupported.
You can choose between archiving in a .zip container, that offers a choice between ZipCrypto and AES-256 encryption, or a .7z container that uses AES-256 and additionally offers the possibility of encrypting file names.
7-Zip is licensed under GNU LGPL with the exception of 7z.dll which is licensed under GNU LGPL + unRAR restriction. Source code is available on SourceForge.