In my system (Audiolinux + Roon Core, with 32GB RAM) I noticed the same problem. From the investigations made so far, the following have resulted:
- Then Roon plays music, the RAM used grows very slowly, but constantly.
- There is a “boom” in the RAM used (~ 5 GB additional) when backing up for the first time. The growth takes place mainly in the “Preparing” phase. After completing this backup, the RAM used does not return to its original value.
- Starting with the second backup, the “boom” in the RAM used is much smaller (~ 1 GB additional). Growth also takes place in the “Preparing” phase. In the “Transfering” phase there is a decrease in the RAM used.
- The increase in RAM used seems to be limited to the maximum value of ~ 8GB (out of 32 GB available). I don’t remember ever seeing more value than that.
- I did not notice that the RAM used to ever decrease, except for the “Transfering” phase from backups 2, 3, 4 etc.
I hope this information will help solve this problem.