Not true, as I did the upgrade to 0.9.7 on Tuesday, and the 1.0.1 yesterday, so I'd say it's quite recent nowHm ... Yes they stopped at realease 0.8.x ... I currently do that manually for each of your release ... it is not that easy s yu think because there are patches in it (systemd/apt stuff) and in fact as soon as upstream changes here you need to experiment.
They all use either explicit versions or references, the version is always marked with an explicit bump commit.Also some dependent libs are not using git tags, so I can only pull master without knowing which was the version to build.
Either use the AUR package as reference for explicit refs where no tags are available (which are only two repositories, IIRC) or as said, use the version bump commits, as well, they are the version usedSo it is a try and error and in the end I may have a build ... not knowing what "version mix" I have
wget http://download.proxmox.com/debian/pve/dists/buster/pvetest/binary-amd64/proxmox-backup-client_1.0.8-1_amd64.deb
# checksum verification
sha256sum proxmox-backup-client_1.0.8-1_amd64.deb
f812593f8f1895fc5cbd5c8b6ec1120a4f863739c7c23aa0f2c15b0f7c59033a proxmox-backup-client_1.0.8-1_amd64.deb
apt update
apt install ./proxmox-backup-client_1.0.8-1_amd64.deb