Update Index While Running and Create Periodic Backups

[OmarMGaber]

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Description

Implement the ability to periodically update the saved index while the search engine is running and to create backups of the current index at regular intervals.

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Expected Outcomes

• Update: After every X minutes, check for changes in the in-memory index and write them to disk without interrupting active queries.
• Backup: Every Y hours, create a snapshot of the index and store it in a backup directory (e.g., backups/).

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