Synology’s ActiveBackup surprised me in it’s quality for being essentially a “”““free””“” (*bundles with hardware) solution. In total it’s saved my bacon about 4-6 times already, twice for a desktop death, two restores of my PDC, one semi-successful save of my DHCP server (it’s eventual death was not ABB’s fault), and one BMR simply to upgrade the disk of a laptop. (Before you ask, yes I do have two AD DCs for homelab). All in all it’s a lovely product, but doesn’t fit the bill as a F/OSS backup system so I don’t feel it deserves a root comment in this thread. I myself have been looking for an OSS solution similar to OP, not because I dislike my ABB deployment, but because I don’t want to be beholden to Synology forever. (they annoyed me s touch over the announcement of drive firmware lock in, and I do want to build my own NAS someday)

My RPO for critical assets (vCenter, AD, NAS, Unifi controller) and my personal desktops is 24h, and RTO of whenever I get to it - but the software itself is pretty fast once engaged (but not wire rate). Non critical assets are backed up on Sunday night. Schedules for both critical and non critical are staggered out along with interleaving with my Syno NAS’s self-backups to USB and Backblaze. If I remember correctly, there is a “max running tasks” gate in ABB, but don’t quote me on that.

Most of my infra is ESX (vSAN, iSCSI, local disk), so the majority of my backups are done using the snapshot-based VM backup feature. This goes pretty smooth and has a pretty fine grained retention schedule, so I’m happy. As a snapshot backup, you can’t restore just one file, you have to restore the VM as a whole.

My other two NAS (the VMs I run TrueNAS and Nextcloud on respectively) use the file server rsync backup method. The latter is Linux and I tried the native Linux agent a while back, but I remember running into a kernel version issue since it would have to install a snapshot driver. I stopped messing with the native Linux agent at that point because I’ve seen what happens to XFS when you run a version of Acronis that doesn’t match the kernel version (it doesn’t end well for your data). Admittedly, that was the first major release of ABB for Linux, so some stuff may have changed in the intermediate. There will come a day when I need to back up a native Linux hardware box, and that day I will also select my distro as much as possible with a matching kernel release to ABB.

Windows native agent is nearly invisible and runs great. MacOS (fingers crossed) I’ve never had to restore from , but my low-use Mac is connected and does show it’s jobs regularly running (and yes, I know it doesn’t exist unless it’s tested :P )