Primary requirement in a end point backup and recovery solution:
• List out the number of users and data size per users.
• What type of file should be backed up from the end devices?
• What should be the retention period of backed up data?
• Plan for storage media to backup data (disk / tape / cloud).
• Depend on data size, provide the Hard disk sizing if it is on-premise.
• Highly recommend: Dedicated server for backup solution software.