Which of the following should be taken into account when estimating the amount of disk space necessary to
store backups? (Choose two.)

A.
Type of a disk (thick or thin)

B.
Total size of used data for the VMs being backed up

C.
Veeam Backup & Replication edition

D.
Hypervisor and host version

E.
Retention period for backups

Explanation:
https://helpcenter.veeam.com/backup/70/bp_vsphere/estimating_repository_capacity.html