Have you checked the SMART values of your drives? Do they give you a reason for your concerns?
Anyhow, you should never be in a position where you need to worry about drive failure. If the data is important, back it up separatly. If it isn’t, well, don’t sweat it then.
Use something like pgAdmin, DBeaver or the pg cli to connect to your postgres instance. Then run the command from the changelog as a SQL query.