On Wed, 9 Aug 2006, Ralf Gross wrote: (...) >> What would be really great to have is the possibility to ensure that I >> have the last n revisions of files; no matter how many fulls or >> incrementals. (...) > > I also think this would be the job of a revision control system.
Or the job of a really smart backup system ;-). (...) >> Any pointers, good ideas, work-arounds or whatever is of course >> appreciated. Thanks in advance! > > How will you ensure that a file has not been changed several times since > the last backup? In what cycle would you start your backup to get every > existing version of that file? I will not ensure that the file has not changed several times between backups. My formulation was inexact, sorry! What I want is the last n revisions of files when they are checked for changes (once a day, week or whatever). I only want the last n revisions of backups, not the "real" file revision. Just to make it totally clear (I hope): If a file has changed when it is being backed up, if there is less that n revisions of the file backed up, do nothing (just back it up as usual), otherwise (back it up and) delete the oldest revision of the file. Actually there would be other possiblities: you could also (1) set a bit that indicates that the file can be deleted, you could (2) delete all the oldest revisions such that there is exactly n left, and maybe some other strategy I haven't thought of yet. The different approaches imply new decisions. Ad (1). When should it be deleted? Should it be decompressed and deleted imediately, once a day, while _nightly runs, or only when all (or x percent) of the files in the compressed file is set for removal? Ad (2). Maybe it would be possible to have a flag or even the possibility of specifying an "algorithm" to decide how many revisions to be deleted (dependant on how often the file changes, how many revisions there are, how recent the revisions changes (in about uniformly or not) etc.). This seems, admittedly, quite strange. > Ralf -- Casper Thomsen ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
