It's a remote backup tool that solved all the problems. It's basically duplicity[2] but without the unfortunate design fault of having to re-upload all your data every few months.

Our[3] customers love it and we see new deployments of it (even among existing customers) every single day.

[1] https://borgbackup.readthedocs.io/en/stable/

[2] http://duplicity.nongnu.org/

[3] http://www.rsync.net/products/attic.html