Backup via customer center and instance snapshot via Horizon

Hello,

i try to find a good solution for the scenario that I need to revert changes (after application updates or so) I did to a virtual machine in the Public cloud.

In OVH customer center I can create a backup of my instance - but this takes to long for me, 2.5 hours in the moment.
I'm not sure if I could start applying my changes to the system right after I hit the instance backup button. Does anyone know if I have to wait until backup is completed?

In Horizon I can create instance snapshots which I can later find as image in Horizon > Images. Would this be a faster solution, create snapshot of my instance and start with applying critical changes to my VM right after hitting the snapshot button?

Any feedback is appreciated!
Thanks and bye, Peter