How does copy on write work?

Related questions

1. How do btrfs snapshots work?
2. Where are ZFS snapshots stored?
3. How do ZFS snapshots work?
4. What is a Btrfs volume?
5. What is Freenas snapshot?
6. What is ZFS snapshot?
7. How do I screenshot on ZFS?
8. What is a recursive ZFS snapshot?
9. What is the benefit of copy on write?
10. What is ZFS replication?

Tags

1. #copied
2. #system
3. #bytes
4. #reference
5. #computer
6. #original
7. #resources
8. #write
9. #efficiently
10. #actually
11. #exist
12. #modified
13. #technique
14. #created
15. #written