Dear e-Spirit vendor,
as with the current custom log4j-Appender "FSAppender" (see "fs-logging.conf": de.espirit.firstspirit.server.logging.FSAppender) there is no possiblity to directly specify the amount of kept log file generations, it might be helpful to offer such a possility.
An example implementation can be found below http://wiki.apache.org/logging-log4j/DailyRollingFileAppender where the introduction of a:
property is already offered.
This would ease the log file handling in FirstSpirit as the system could directly offer an automated log4j-based rotation solution then.