You can create other encrypted volumes using *LUKS* to encrypt, for example, another USB stick or an external hard disk.*LUKS* is the standard for disk encryption in Linux.
You can also open *VeraCrypt* encrypted volumes in Tails. *VeraCrypt* is a disk encryption tool for Windows, macOS, and Linux. [[See our documentation about *VeraCrypt*.|veracrypt]]
For example, image thumbnails might be created and saved by the other operating system. Or, the contents of files might be indexed by the other operating system.