I think this TimeBaseRollingPolicy is going to backup or archive the last X days to new archive file and then the new current active log file startwith blank file. What I want is the current active file is always keep the last X days data( for example last 7 days). chrop off the 8th back day's data. Kevin From: Logback-user [mailto:logback-user-bounces@qos.ch] On Behalf Of Roger Thomas Sent: Monday, 6 October 2014 1:14 p.m. To: logback users list Subject: Re: [logback-user] How to do this requirement Yes, this can be done with a TimeBasedRollingPolicy http://logback.qos.ch/manual/appenders.html#TimeBasedRollingPolicy Roger On 06/10/2014 00:20, Ren, Kevin wrote: Hi, Is it possible to keep the current log for last X days? archived the X+1 day back to another file. Thanks Kevin ________________________________ Confidentiality notice: This email may contain information that is confidential or legally privileged. If you have received it by mistake, please: (1) reply promptly to that effect, and remove this email and the reply from your system; (2) do not act on this email in any other way. Thank you. ________________________________ _______________________________________________ Logback-user mailing list Logback-user@qos.ch<mailto:Logback-user@qos.ch> http://mailman.qos.ch/mailman/listinfo/logback-user ------------------------------------------------------------------------------ Confidentiality notice: This email may contain information that is confidential or legally privileged. If you have received it by mistake, please: (1) reply promptly to that effect, and remove this email and the reply from your system; (2) do not act on this email in any other way. Thank you. ------------------------------------------------------------------------------