You can't really expect a library with hardly any money to do something like that. With companies, however, I would expect them to have a backup of their entire system so that, if something like this happens, they can simply format everything and restore the backup without significant downtime. Ideally, this should be done in a way that isn’t tied to specific hardware. Then they can simply store the backup with AWS or a similar provider and, if necessary, activate the server and continue working from there.