I didn't know there was a bug with veeam... I'll look for that.
This is the thread: https://forum.proxmox.com/threads/veeam-silent-data-corruption.155212/
tldnr: Blockbridge (bbgeeks employer) encountered a data corruption issue during their tests, Veem published a fix but at the moment it still needs testing. There are some first positive reports though. You will want to read the whole thread to get the whole picture.