Update server storage planning needs for at least 2017

Originally created by @intrigeri on #11806 (Redmine)

This is basically #10851 (closed), 2017 edition. See parent ticket for other things that need to be taken into account.

Parent Task: #11680 (closed)

Related issues

• Related to #10851 (closed)
• Related to #12008 (closed)
• Related to #12119 (closed)
• Related to #12469 (closed)
• Related to #15780 (closed)
• Blocked by tails#12002 (closed)
• Blocks #12111 (closed)
• Blocks #13425 (closed)