Disk-Based. If disk-based backup is chosen, ▇▇▇▇▇▇▇ suggests a standard 14-day backup plan. The Customer may however deviate from this if it requires such. In order to be able to guarantee at least one backup, a minimum of 110% of the regular storage space must be made available as backup space. In principle, 100% extra backup storage must be made available for each daily guaranteed backup version. This applies only in the unlikely case that 100% of the data would daily change. In practice, we observe an average data change ratio of 10% per day. That is why Combell suggests to make space available for 1 weekly full backup (100% of the regular available space) and 6 incremental backups (6 x 10% changes of the space made available daily). After one week, this amounts to 160%. Although the Customer can determine the frequency and the retention period of its backups itself, Combell advises the Customer to provide backup means for a 2-week period, meaning that 320% of the regular storage space will be required as backup space. This is the only way Combell can guarantee the Customer a retention period of 2 weeks.
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