ApsaraDB RDS:Use wget to download backup files in Linux

For more information, see the following topics:

• ApsaraDB RDS MySQL downloads data backup files and binary log files
• ApsaraDB RDS SQL Server download data backup files and binary log files.
• ApsaraDB RDS PostgreSQL downloads data backup files and binary log files
• ApsaraDB RDS MariaDB downloads binary log files

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