Using unison was most promising and is quite straight forward. Attached you find a config file template.
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# Here are the two folders that shall be synced
# Please create a local folder groupofficesynced, from there you may set links (alias) to other folders if you want
root = /home/ras/syncRAS
# Either unison is available on the server and can be reached through ssh (fast and reliable)
root = ssh://email@example.com:1234//home/groupoffice/users/ras
# Or the remote folder is mounted locally through webdav (very slow syncing, lot of traffic, as all remote files are hashed locally)
# root = /media/groupoffice
If you use the more reliable ssh option, then you need to ensure that both client and server have the same unison version. Simply test with
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unison groupofficesynced/ras ssh://firstname.lastname@example.org:1234//home/groupoffice/users/ras
1234 is the non-22 port for SSH. Ubuntu or Debian packages do not have the latest stable unison versions, so best is you install it from here http://alan.petitepomme.net/unison/ (we are using 2.40.61, which is available for all platforms).
Here is the user manual: http://www.cis.upenn.edu/~bcpierce/unison/download/releases/stable/unison-manual.html
Variants and privacy notes
1. Using the Webdav option (webdav mounte locally), you sync exactly the same file structure that you see in the Web-GUI, including any shared folders, for which you have permissions, but it is slow.
2. Using the SSH way, you may have permission problems as all users belong to www-data. You could sync any user folder, as in /home/groupoffice/users . Reason is that you have to add your user to the www-data group and thus you gain access to all. Any idea to map permissions correctly? Maybe with the userpermissions module?
3. Creating a webdav drive for each user on the server itself to sync against works best and is reflecting all access rights correctly, but is a bit more complex to set up and may not scale. You need to create a davfs2 drive for each user on the server http://group-office.com/wiki/WebDAV#Davfs2. Do not forget to add the hostname for which the GO license has been purchased in /etc/hosts, otherways all internal webdav traffic may circulate through the Internet.