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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-10-13 from rev 5ee52f8d25b5.

Backuping and restoring

rsync

Emulate file transfer with -n or by longer form --dry-run.

Use FS with hardlink with cp -l:

$ cp -al  /backup/old /backup/new
$ rsync -a --delete --progress /data/ /backup/new/

Use FS hardlink exclusively with rsync:

$ rsync -a --delete --progress --link-dest=../previous /data/ /backup/new/

Note

--link-dest accepts a relative path, it is relative to the destination directory.

Note

Cygwin rsync implementation can use NTFS hard links with --link-dest option. Check it with:

cmd> fsutil hardlink list c:\backup\new\file.txt

Avoid carrying permissions and other attributes with:

--no-p --no-o --no-g --no-A --no-X -O -J

To show current progress:

-v  --progress

To copy over ssh:

$ rsync -n -e 'ssh -l $RUSER' -r  /archive/ $RHOST:/archive/
$ rsync -n -e 'ssh -l $RUSER' -r  /archive/ $RUSER@$RHOST:/archive/

To compare only based on file size use --size-only. In that case -t option will preserve modification time.