The following items can be cheaply recovered elsewhere in the event of destruction:
- Power plant (recovery cost: 1 gold per piece)
- Military central (recovery cost: 1 gold per piece)
- Base command (recovery cost: 1 gold per piece)
- Base defense Upgrade Level 2 (recovery cost: 1 Gold per piece)
- Base defense Upgrade Level 3 (recovery cost: 3 Gold per piece)
- Base defense Upgrade Level 4 (recovery cost: 9 Gold per piece)
- Base defense Upgrade Level 5 (recovery cost: 19 Gold per piece)
- Base defense Upgrade Level 6 (recovery cost: 49 Gold per piece)
- Base defense Upgrade Level 7 (recovery cost: 99 Gold per piece)
- Factory extension (recovery cost: 9 gold per piece)

How to recover?
In this screenshot 5 power plants can be recovered: