I manage approximately 90 iMacs in a school. We have just been set up with a Retrospect backup solution. All are fresh Yosemite (10.10.5) installs with Retrospect 12.5.0.111 client connecting to server on same version and same network.
I am able to add all the macs to the sources then add them into the scripts for our media sets (Photography, Media, Music). When the scheduled backups run however, the majority or connected machines fail returning error code -505 Client is Reserved. Maybe 3-4 successfully connect and back up in each media set.
I am able to disconnect (Cmd + click "off" on the client's retrospect configuration) then reconnect them so they don't report the error anymore but by the time they try to backup (an overnight process) they are reporting the same error again.
I really need to get this working as, at the moment, all our student's work on the macs is not being backed up, this is not an acceptable position for the school to be in.
Any help would be much-appreciated!