Privacy-friendly Cloud Support
Optional Cloud Storage and Upload
All PEAs (PEA = Password Encrypting Archive) work also fine with all features offline, without any internet connection. Cloud access works manually, you must explicitly enable it. There is no automatic synchronization or any other cloud connection that you have not agreed to.
The content remains encrypted during every upload or download process and is only stored in encrypted form in the cloud. The possibility of inadvertently transferring data unencrypted is minimized because the data is generally never stored even on the hard disk in plain text.
If you don't use a PEA with the key file property, then the protection is only as strong as your password. Your password should be unique and as long as possible (a passphrase consisting of several words). Using the character tables from the PEAs menu with unusual characters increases their security.
Keep in mind that - although the contents are safe - the meta data of the files are not protected: File names, modification dates, etc. are visible to the cloud provider. If that makes you uncomfortable, then pick your cloud provider with care.
Supported Cloud Providers
Many of the major players are not supported: Google Drive, Microsoft OneDrive, Apple iCloud, Amazon Cloud Drive... The PEAs intend to be privacy-protecting applications, which is why these providers are at the bottom of the to-do list.
The WevDAV Protocol
Currently only providers with WebDAV support are included.
WebDAV (Web Distributed Authoring and Versioning) is an extension of HTTP, the basic data communication for the World Wide Web, that allows clients to perform remote Web content authoring operations. This standard allows multiple cloud providers to be supported.
If you take a look around, you can find many such vendors: free or low-cost, privacy-compliant providers, vendors that run open source software, those that offer reliable support...
To take advantage of cloud support, you must already have an appropriate account.