Old data removed automatically - details?

In index.rst it states that old data is removed automatically:
"Server is also responsible to keep the storage clean and remove old data automatically."
How often and which data is removed? Are there any ways to change configuration of that or do you have to write a cleanup job your self?
E.g. to make sure that database does not fill to much.

Start with the cleanup statement in index.rst and inspect the relevant Hangfire storage and server documentation to determine the cleanup interval, affected data, and available configuration. Document those answers, including whether users need a separate cleanup job, and verify that the database-retention guidance is clear.

Written by the indexing model from the issue text.