"System snapshots are exactly what they sound like: a saved point in time -- when your computer system was working as expected -- that can be restored in case of a PC emergency (or even a non-emergency). Say an upgrade goes south. If you've created a system snapshot (or your OS automatically created one) prior to running the upgrade, you could simply restore your machine to that earlier snapshot, and you're back in business."
"Snapshots capture an exact state of a system at the moment it's taken. A snapshot can include the operating system's files, its configuration, and even the contents of memory. Snapshots are usually stored on the same system as the original data, so they're very fast to create and use (and you don't have to worry about privacy risks). Subsequent snapshots only store the changes made since the previous one was taken, so they are much smaller and quicker to create than a full backup."
System snapshots capture a complete, restorable state of a computer at a specific moment, including OS files, configurations, and sometimes memory contents. Snapshots are typically stored locally and use copy-on-write or differential methods so subsequent snapshots record only changes, making them fast and space-efficient. Many operating systems include automatic snapshot tools; if not, third-party snapshot software should be installed to enable quick recovery after failed updates or problematic changes. Snapshots provide faster, smaller recovery options than full backups and allow restoration to a known-good state without requiring external storage for each capture.
Read at ZDNET
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