Re: [rdiff-backup-users] What happens when you move files around?

[dean gaudet]

as a one time hack, if you want to reduce the network bandwidth required 
to move the 1GB file you could hardlink the oldfile to the newfile (and 
leave the oldfile around for now) and then do a backup... rdiff-backup 
will detect the hardlink and just hardlink the destination file in the 
mirror without retransmitting the file.

however when you delete the oldfile and do another backup then you'll end 
up with a reverse delta for the 1GB file... rdiff-backup has no way to say 
"create it from this other file over here".

so basically you can just save yourself some network bandwidth, but not 
backup-server disk space.

it really does beg the question... why can't rdiff-backup do this itself?  
in general keeping track of all dev:inode pairs in a backup can consume 
way too much memory (think 10s of millions of inodes on some 
filesystems)... however it would seem possible to look around in the same 
directory for a renamed file (i.e. log file rotation).

i hack around this by rotating my log files by date.

http://arctic.org/~dean/scripts/date-rotate

-dean

On Sat, 25 Nov 2006, roland wrote:

> afaik, rdiff-backup doesn`t detect file moves, so the file will be backed up
> another time and another GB of storage is needed for that.
> 
> regards
> roland
> 
> ----- Original Message ----- From: "Karjala" <address@hidden>
> To: <address@hidden>
> Sent: Saturday, November 25, 2006 7:25 PM
> Subject: [rdiff-backup-users] What happens when you move files around?
> 
> 
> > On my system I move files around directories a bit. How are files that have
> > been moved since the last backup treated by rdiff-backup? I.e. if I rename a
> > 1GB file that has already been backed-up, will one extra GB of backup
> > storage be taken up on the next automated backup? Also what would happen to
> > the amount of backup storage required, if I moved a 1GB file to another
> > directory (which will also be backed up on the next backup)?
> > 
> > Thanks,
> > - K.
> > 
> > 
> > _______________________________________________
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> > http://lists.nongnu.org/mailman/listinfo/rdiff-backup-users
> > Wiki URL:
> > http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki 
> 
> 
> 
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