RSYNC

I wanted to backup my work on the new NAS volume I created. Specifically, everything in the /home directory. The first time I backed it up I used "cp -rp". That took a which to backup since I am currently using a USB port. Anyway, as you can see below its about 7 gig and growing. So the next time I used rsync.
The first time I used rsync it took about the same amount of time. Below the output of the df you'll see rsync in action. Rsync, after the first transfer, and this could be to a remote host, will copy the new files.

gcr@localhost ~]$ df -h /NAS
Filesystem            Size  Used Avail Use% Mounted on
NAS                   2.7T  6.9G  2.7T   1% /NAS
[gcr@localhost ~]$

Basically after backing up the /home directory, the only changes have been as a result of web action. So instead of backing up the 7 gig again, only a small portion of it gets moved:

bash-4.2# rsync -av /home /NAS
sending incremental file list
rsync: readlink_stat("/home/gcr/.gvfs") failed: Permission denied (13)
home/gcr/.xsession-errors
home/gcr/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend/
home/gcr/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend/soprano-virtuoso.db
home/gcr/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend/soprano-virtuoso.trx
home/gcr/.kde/share/apps/okular/docdata/19908381.w_free01-2.pdf.xml
home/gcr/.mozilla/firefox/t4e2qibe.default/cookies.sqlite
home/gcr/.mozilla/firefox/t4e2qibe.default/cookies.sqlite-shm
home/gcr/.mozilla/firefox/t4e2qibe.default/cookies.sqlite-wal
home/gcr/.mozilla/firefox/t4e2qibe.default/places.sqlite-shm
home/gcr/.mozilla/firefox/t4e2qibe.default/places.sqlite-wal
home/gcr/.mozilla/firefox/t4e2qibe.default/Cache/_CACHE_001_

sent 23399659 bytes  received 21406 bytes  57758.48 bytes/sec
total size is 6026219118  speedup is 257.30


This is much fast, especially if it is to a remote host.