When a user logs in to a system through SSH or a communication application, the system by default sets the current directory as the user's home directory. For example, if you log in as user root, then the user’s home directory is /root. Any user-generated data (temporary files) is stored in the user's home directory and is included in the Server Manager backup operation. If such data accumulates, the database size increases, which in turn increases the duration of backup and restore operations.
Hence, it is recommended to:
Redirect any data (temporary files) that you manually generate from user's home directory to the /tmp directory.
Delete temporary data from the user's home directory before performing a backup from Server Manager (Administration > Backup).