This can begin to occur when your Confluence site has grown to a certain size that the database connections times out, during the backup operation:

Stacktrace:

java.sql.SQLException: Communication link failure: java.io.EOFException, underlying cause: null

    • BEGIN NESTED EXCEPTION **

java.io.EOFException

STACKTRACE:

java.io.EOFException
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1394)

Increase the wait_timeout variable in the Mysql configuration file.

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