Home / server / Questions / 782388
In Process
Memes
Asked: 2016-06-07 23:34:32 +0800 CST

rsync to backup a multi-user NAS

  • 772

The setup :

  • a Ubuntu server with samba shares to 25 users all with Windows (different locales).
  • the Ubuntu server then has a daily cron job executed as Admin (not root) running rsync to backup the shared folders to a Synology NAS. the report of this sync is sent by email.
  • the Synology NAS is mounted through /etc/fstab on the Ubuntu server using the admin account credentials, the rsync is from local folder to mounted folder.

Here my /etc/fstab line

//192.168.0.30/NetBackup /mnt/SynologyNAS/NetBackup cifs credentials=/home/admin/.nascredentials,iocharset=utf8,gid=1000,uid=1000,file_mode=0777,dir_mode=0777,rw 0 0

The problem : I have quite a few files that are copied everyday, generating a 2MB report email instead of few kB. those files are those who have a owner that is not admin.

For instance :

  • Admin creates a file in the samba-shared folder Public, it will then be backed up by the cron job. The owner of the file in the backup folder is Admin. Following day, no copy happens.
  • UserNotAdmin creates a file in the samba-shared folder Public, it will then be backed up by the cron job. The owner of the file in the backup folder is Admin. Following day, copy happens again, and so on.

Here is my rsync line

rsync -av --no-perms --no-owner --no-group --delete /share/localFolder/ /mnt/SynologyNAS/NetBackup/remoteFolder

I also already tried 

rsync -avO --delete /share/localFolder/ /mnt/SynologyNAS/NetBackup/remoteFolder

and 

rsync -vrltD --delete /share/localFolder/ /mnt/SynologyNAS/NetBackup/remoteFolder

How to setup everything so that they are copied once and for all?

rsync

1 Answers

  1. Your rsync job is not preserving owner/group information. Please add the -a parameter to your rsync command (eg: using rsync -av <src> <dst>)

    • 0