基于此，通过对网络数据备份的基本流程进行分析，提出一个基于数据量变化率函数的备份代价评估模型，并给出初步的量化公式。
By analyzing the key procedure of data backup, a model of data backup cost was put forward and the computing formula accordingly was given.
对那些不曾刻意寻觅成功诀窍的人来说，花再大代价，也学不来这个窍门。 这个公式既不能免费奉送，也不能用金钱买卖，因为这个秘诀分为两个部分。
It cannot be had at any price by those who are not intentionally searching for it . it cannot be given away , it cannot be purchased for money , for the reason that it comes in two parts .
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