I have been searching for the definitive way to calculate how much storage I need for backup copies. R = number of rollbacks (or increments) according to retention policy (14 by default)ĭ = average amount of VM disk changes between cycles in percentĭata=11TB and will grow to 22TB in 3 years How many full backups wil I have? It's important to know to calculate the required disk space by using this formula:ĭata = sum of processed VMs size (actually used, not provisioned)Ĭ = average compression/dedupe ratio (depends on too many factors, compression and dedupe can be very high, but we use 50% – worst case)į = number of full backups in retention policy (1, unless backup mode with periodic fulls is used) We use Veeam 7, and thanks to the new backup copy job feature we can use GFS-rotation, but I'm wondering how many full backups the backup copy job will create in the folowing situation:
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