Did you ever figure this out or did they fix it in an update after this? I was having a similar memory leak issue after reinstalling Proxmox Backup Server with version 4. I didn’t have this issue with version 3. Started doing this immediately after migrating to a fresh version 4 VM. Nothing has changed between the VM I have using version 3 and the new VM using version 4 but I had to increase RAM from the previous 4GB to 16GB just to get teh VM to stop crashing/freezing with OOM errors and not realizing it until a month later when I go to run updates and realize the stupid PBS VM only stayed running for 1 week or less before it went OOM again. Increasing RAM to 16GB seems to have temporarily fixed the issue but this is only a work around that isn’t viable long term because it is nearly using the entire 16B for some reason when nothing has changed from it’s config or backup load between the old VM w/ version 3 and this new VM I migrated everything too with version 4.
I need to lower the RAM back down to a sensible amount, 4GB is the recommend for a small PBS server, and the most I feel comfortable using is 8GB, which is definitely overkill for the little backup load I have on it. Seems I am going to have to migrate everything back to version 3 again if they have not fixed this in updates after the one mentioned in your post. Not sure if there is any other good free alternatives to Proxmox Backup Server either but may have to start looking into that or spending the insane money on RAM and NVMe drives for my Truenas Server to do the deduplication itself instead, just so I don’t have PBS taking up 16GB to backup like 200GB give or take of used VM/CT data between 10-15 VMs/CTs.
