[rdiff-backup-users] rdiff-backup detecting moves ?

[devzero]

hello!

i read the thread at: 
http://rdiff-backup.solutionsfirst.com.au/index.php/DetectMoves

and i also think that it would be very useful, if there would be a feature for 
detecting if files are being moved.

think of the following:

you are backing up a 500GB Server over a line with small bandwidth (that`s why 
we use rdiff-backup ;)  )  to a backup-machine with "just enough" diskspace. 
typical daily backup maybe 5GB for all the stuff users are storing/changing in 
their homedirs.
now there is a user who has 50GB directory-tree and decides "oh - ok - letŽs 
rename that dir".

bang! :(

this will kill your bandwith and also kill your diskspace - and skip your daily 
backup because you cannot transfer that data inside the backup window 
(typically 24hrs) -  and that just because it is transferring and storing 50 GB 
of data we already have....

ok, this is quite extreme example, but there maybe many others some others - 
and - anyway, rdiff-backup is storing redundant data into the backup repository.

i like the idea of an inode-tracking approach, because data isn`t typically 
moved between partitions, but moving data inside a partition or renaming a 
directory happens quite easily (and even accidentally with windows explorer - 
this just coming to my mind while writing these lines - think of a samba-share 
exporting large project directories, used by tens or hundreds of users - now a 
user accidentally moves a directory tree and he or some other person detects 
that errror on the next day - this means rdiff-backup is storing redunant data 
even two times)

regards
roland
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