John Goerzen <jgoerzen <at> complete.org> writes: > http://backuppc.sourceforge.net/faq/limitations.html#incremental_backups_might_not_be_accurate
> there is documented a limitation of BackupPC incrementals with tar: > since it uses timestamps only, it may miss if someone does something > like unpack a ZIP file that contains files with timestamps in the past. > It also won't note if files were deleted. I'm beginning to think that the documentation here is wrong. I will do some testing tomorrow. I think it is right regarding the deleted files, but wrong regarding things like recently-unpacked ZIP files with timestamps in the past. GNU tar's manual says that --newer looks at "files whose data modification or status change times are newer than the DATE given". In other words, it examines both mtime and ctime. If my understanding is correct, when something like an old ZIP file is unpacked, unzip will set the mtime, but in so doing forces the ctime to be updated to the current time. Therefore, assuming clocks are not wildly out of sync, this should pose no problem. Right? I will run some tests to validate this assumption tomorrow. If it pans out, then it may just make sense for me to use tar instead of rsync for all local hosts. The deleted files issue is not particularly critical for me. I am then just left with the bug that doesn't let me restore, using the CGI, from a backup made on a machine using tar to a machine using rsync. I ran into the problem at http://news.gmane.org/find-root.php?group=gmane.comp.sysutils.backup.backuppc.general&article=23890 which sadly had no responses. -- John ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
