I'm hoping someone could shed some light on a fairly strange issue I am having with a client.
My client has a single server running Windows SBS 2011 Std + Symantec System Recovery 2013.
They have a backup every two hours to an internal 1TB SATA hard drive located inside the server.
After the backup completes it should than carry out an offsite copy to one of two external 1TB USB hard drives which are plugged into the same server and are rotated daily.
The backup itself does not have a problem running and completes successfully with incrementals competing within two to three minutes, and the offsite copy around five to six minutes to the USB drive.
My issue is, that the time between completing the backup to the internal drive and starting the offsite copy to the USB drive appears to be increasing after every backup.
For example the 08:30 backup completes at 08:34, than the offsite copy starts at 08:35.
However than the 10:30 backup completes at 10:34, but the offsite copy does not start until 10:45.
Followed by the 12:30 backup finishing at 12:34, than the offsite copy starting at 12:55
The increasing gap generally doesn't follow a particuarly patten, sometimes the gap increases by two minutes, other times by ten.
If you leave this to continue, you eventually have a situtation that the offsite copy does not complete until two hours after the orginal backup took place. Which causes problems particuarly at the end of the day when my client wants to take the USB hard drive offsite with the most recent incremental point on it.
Manually running a backup does exactly the same thing and I have tried starting and stopping the System Recovery service which has not made a difference. I have also tried recreating the backup job from scratch with no joy.
There are no errors in the event logs which simply state when the backup starts and finishes, and when the offsite copy finishes.
Does anyone have any suggestions to this?