In your opinion what's the best way to do and restore full backups of a Linux server?

I use proxmox and proxmox backup server (in a vm). I reinstall them both, and re-add lxc and vm and their drives from backup. has already worked once.

important files are additionaly synced to laptop and phone using syncthing.

proxmox backups (which are encrypted) are rcloned to backblaze for offsite backup