<configuration scan="true" scanPeriod="10 seconds" debug="true">
    <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>mylog.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>mylog-%d{yyyyMMdd-HHmm}.%i.log</fileNamePattern>
            <maxFileSize>2KB</maxFileSize>
            <maxHistory>1</maxHistory>
            <totalSizeCap>10KB</totalSizeCap>
            <cleanHistoryOnStart>true</cleanHistoryOnStart>
        </rollingPolicy>
        <encoder>
            <pattern>%msg%n</pattern>
        </encoder>
    </appender>
    <root level="DEBUG">
        <appender-ref ref="ROLLING"/>
    </root>
</configuration>

public class Main {
    private static final Logger log = LoggerFactory.getLogger(Main.class);
    private static final long ONE_MILLION = 1_000_000L;

    public static void main(String[] args) throws InterruptedException {
        for (int i = 0; i < 10000; i++) {
            log.info("I write in log {} times", ONE_MILLION + i);
            Thread.sleep(100L);
        }
    }
}