How it works/why it works?

[m3a2r1]

I've installed pbs for testing. Then I've backed up one of my vms with 100GB hdd. After 3 next days I've got 3 incremental backups of that vm but used space on pbs is only 66GB. How is it possible? How it works? Maybe I haven't got full backup?

 

[tom]

See https://pbs.proxmox.com/docs/introduction.html#main-features