You may want to check out our open source project: Proxmox Backup Server, it supports 3-2-1 relatively integrated by: - integrated tape backup (LTO-4 or newer)

You may want to check out our open source project: Proxmox Backup Server, it supports 3-2-1 relatively integrated by: - integrated tape backup (LTO-4 or newer), this allows to fulfill the two different medium rule and may also help on the offsite one (e.g., but a tape in a safe at CEO's home once a week or so) - efficiently mirroring of backup data to remote PBS (offsite copy) - client-side encryption, because well, backups are good but maybe not so if they're leaked - file-level and block level backup - disclaimer the former currently only for Linux clients and the latter can handle anything but also runs on Linux (VMs are used) The introduction/main feature section of the docs contain more info, if you're interested: https://pbs.proxmox.com/docs/introduction.html https://pbs.proxmox.com/docs/introduction.html If you have your non-Linux workload contained in VMs and maybe even already use Proxmox VE for that it's really covering safe and painless self-hosted backup needs.