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Parent task: #15864

I am learning how to run the test suite. In various parts of the documentation there are referencies to "snapshots", but the option --keep-snapshots is never suggested in https://tails.boum.org/contribute/release_process/test/usage/

I understand that it is common to use it when developing, so it might be suggested; I also guess that it could need lots of disk space, so maybe that should be documented, too.