You can check which version a client is running by checking the access log.
The default location of the access log file is:
Windows: “C:\Program Files\Offsite Backup Server\logs\access_log*.txt”
Linux: “/usr/local/obs/logs/access_log*.txt”
Mac OS X: “/Applications/OBS/localhost/logs/access_log*.txt”
The ‘/obs/obcX.X/file/????File.obc?u=USER_NAME&..ver=Y.Y’ entries contain this information, where:
USER_NAME = Login Name of a backup account
X.X = major version of the client software
Y.Y = minor version of the client software