I am using SizeAndTimeBasedRollingPolicy and I was wondering why logback ignores my totalSizeCap settings. totalSizeCap was set to 5GB and the total size of my log files was about 8GB. I started my application (a Spring Boot Application) and no files were removed. When testing with smaller settings (256MB totalSizeCap) files were removed as expected.

So I debugged TimeBasedArchiveRemover.capTotalSize and found out that totalSize got negative. Making totalSize (and totalRemoved) long instead of int should fix the problem.