Basically, most sources are kept for a little amount of time during which the tool can analyze the text you enter before creating a result, since this is part of how these systems function. The key point to focus on is not whether your work is saved within a system but rather what happens to your writing after it has been processed. Some companies will keep each submission in a common database forever so that if you ever submit something else to an alternate location, it can be shown as a duplicate.

Quetext does not function this way; it will only save your text at the time of checking so that it may create a report based on the checked text. Moreover, once you receive your report, you may delete it at any time and no longer have any of your writing stored in the company's network. To ensure proper use of these systems before submitting anything, read the intended company's privacy policy to see how long it plans on retaining your work, whether you are able to delete your submission, and whether they plan on including your writing in an overall shared database with other users' submissions.