When Symantec Antivirus client (SAV/SEP) finds an infected item that cannot be repaired with the current virus definitions, it blocks access to the item. The products then package the item along with any affected system files and settings, and move the package to the local Quarantine. The local Quarantine is a special location that is reserved for infected files and related system side effects. After viruses and other threats are isolated in a local Quarantine, they are unable to damage or spread on the computer.
Quarantined means the file has been moved from it’s original location to the quarantine folder and re-encoded so it is essentially in virus prison.
Repaired means the file was infected (code injected into a legitimate file) and then quarantined but then new virus definitions were released that were able to remove the infection and the file was repaired and returned to it’s original location.
Backup means the original file has been returned to it’s original location but there is a backup being kept in Quarantine.
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p>Reference: Clarification on Quarantine types
