I have a daily rsync script backing up my data on an external hard drive at /mnt/X (root of hard drive). I am using --link-dest to use hard links and avoid duplicating data. I need to move all my daily backups from /mnt/X to /mnt/X/backups without loosing the hard links. Later I will need to change the script to backup in the new dest directory which is /mnt/X/backups and look for previous day backup in the same directory.

How would you suggest me to do the move?

  • Look at rsnapshot instead
    – roaima
    Apr 11 '20 at 11:34

You don't have to do anything special. Simply,

mv /mnt/X/* to /mnt/X/backups/

(You will get an error about not being able to move backups to itself).

A hard link is basically an inode number. Files that are hard-linked have the same inode number. However you move them around within the same file-system, the inode number does not change. So there is no special action needed.

Try it for yourself with some simple files in /tmp first:

/tmp $ mkdir aa
/tmp $ touch aa/f
/tmp $ ln aa/f aa/g
/tmp $ mkdir aa/new
/tmp $ mv aa/* aa/new
mv: cannot move 'aa/new' to a subdirectory of itself, 'aa/new/new'
/tmp $ ls -il aa/new/
13185910 -rw-r--r-- 2  0 Apr 11 13:32 f
13185910 -rw-r--r-- 2  0 Apr 11 13:32 g

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