<p>Running Tails inside a virtual machine has [[various security implications|virtualization#security]]. Depending on the host operating system and your security needs, running Tails in a virtual machine might be dangerous.</p>
The content of the USB stick is lost in the operation, but an attacker might still be able to tell that Tails was installed on that USB stick using [[data recovery techniques|doc/encryption_and_privacy/secure_deletion]].
This can be achieved using a technique called [[!wikipedia cold boot attack]]. To prevent such attacks, the data in RAM is overwritten by random data when you shut down Tails.
Operating systems do not actually remove the content of a file when the file is deleted, even after emptying the trash or removing the file from the command line.
The *LibreOffice* website provides complete [user guides](https://wiki.documentfoundation.org/Documentation/Publications) for each of these tools, translated into several languages.