Backup VM Online or Offline

[Williams007Pad]

Hello community

I am new to this great tool, I have some questions, what is the correct way to backup when the virtual machine is online or offline? What will the differences be? What takes longer?

I want to backup my entire VM (25 VMs) because I have to rebuild my RAID.

Thanks

[Gostev]

Welcome! It does not matter, either way works and there's no difference. Thanks!