Hello,

I am facing an issue when using --link-dest and --backup-dir together. When a 
source file differs from the file in the destination directory and the --backup 
and --backup-dir options are provided then a copy of the destination file is 
made in --backup-dir. However, if additionally --link-dest is provided and the 
source file is found in --link-dest then the file in the destination is not 
copied to --backup-dir but deleted instead. The following commands demonstrate 
the issue:


> mkdir src ref tgt bkp
> touch src/file ref/file
>
> sleep 1
>
> echo "content" > tgt/file
>
> echo "Initial stats: stat -c '%i %n %y'" src/* ref/* tgt/* bkp/*
> stat -c '%i %n %y' src/* ref/* tgt/* bkp/*
>
> echo
> echo "Running: rsync --link-dest=../ref -a -b --backup-dir=../bkp src/ tgt"
> rsync --link-dest=../ref -a -b --backup-dir=../bkp src/ tgt
>
> echo
> echo "Final stats: stat -c '%i %n %y'" src/* ref/* tgt/* bkp/*
> stat -c '%i %n %y' src/* ref/* tgt/* bkp/*
> echo "File in 'tgt' is hardlinked against 'ref' but no backup of previous 
> file in 'bkp'."


I checked the manpage entries for --link-dest and --backup-dir, none of them 
explain the observed behaviour. While the passage at --link-dest warns that 
destination files may get their attributes "tweaked", it doesnot explicitly 
state that the --backup and --backup-dir options will be ignored.


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