Proxmox VE has an advanced scheduler for your backups. You can add all your virtual machines and containers into a scheduled or multiple jobs with different retentions, notes and bandwidth limits.
To be able to configure a backup job from your remove PVE instance you need to already have added your Cloud-PBS instance following this docs.
Once your are connected on your Proxmox VE interface :
On the first tab :
For a better backup consistency, you should prefer using the stop mode. This mode results in a short vm interruption. If you don't want this, prefer using snapshot mode (if your storage is compatible).
Start by testing before production is the best solution but if you're in a hurry, then prefer snapshot mode.