take advantage of LVM snapshots. Take snapshots before and after an upgrade. In case, if the system is in unrecoverable position, rollback to the last snapshot from a system rescue LiveCD. A useful program for this, as well as regular system backups is timeshift

When running this small application with Wizer, it only takes .36 milliseconds (or 360 microseconds). This is more than 13 times faster than what we’d expect with the JS isolate approach. We get this fast start-up using something called a snapshot. Nick Fitzgerald explained all this in more detail in his WebAssembly Summit talk about Wizer.