Just built and installed UrBackup server on a Pine64 running Ubuntu Xenial Armbian. There was no Armv8/Arm64 build on the PPA so needed a source build. No problem but I did need to install libcurl4-openssl-dev to satisfy the libcurl dependency and also configure with the --enable-embedded-cryptopp option (I got package conflicts trying to install crypto++ and using embedded seemed easier than trying to work out the conflict problem).
Not configured or tested it yet but I can browse to the port 55414 page without problems so hopefully all is good.
Thanks for the nice, clear build/install/deploy instructions.