Cloud accounts · Passwords, keys and privacy
Are my transfers to cloud accounts encrypted in transit?
Short answer: Yes for Google Drive, Dropbox, Amazon S3, typical S3-compatible services and SFTP. Plain FTP isn't encrypted, which is why it carries a warning. A self-hosted server is encrypted only if its endpoint uses https.
For Google Drive, Dropbox, Amazon S3, typical S3-compatible services and SFTP, yes — the connection between your Mac and the service is encrypted. Plain FTP is the exception: it isn't encrypted, which is why Storage Studio warns you before you add an FTP account.
A self-hosted bucket storage server is encrypted only if its endpoint uses https://. Once your files arrive, how they're stored is up to the provider; check their own documentation for storage-side encryption options.