Sorry for warming up this older topic, but I think this is still a very interesting combination.
IPFS itself isn’t THAT interesting to support, since the data would stay on the current machine, and you have to manually move the data to other machines by pinning on them.
Much more interesting would be support for the IPFS-Cluster system, where you can specify how many copies of each file or directory pinned there should be stored in the cluster.
This way you can spread backups on N machines without any manual work.
Additionally in the long run filecoin could be an interesting solution, if you don’t want to setup N machines to hold your backups, but just pay someone to host your data.
Since both works with IPFS in the background, you gain the same content addressed storage space.