Depending upon the frequency with which you synchronize data to .Mac, and the count of synchronization categories involved, it may be that your DotMacTranslator.x.log files may be the culprit. I have nine at the moment—only one of which is current—buried in the
DMTLogging folder, here:
Macintosh HD:Users:<username>:Library:Application Support:SyncServices:Local:Compat:DMTLogging
That folder, and those nine files, account for 9.6 megabytes of the 34.2 megabyte total size of my SyncServices folder. The
clientdata folder is 17.2 megabytes, accounting for a little more than half the total. That clientdata folder contains data that you cannot arbitrarily remove, as it is critical to maintaining data integrity. The older log files, I believe, can be safely deleted from the DMTLogging folder.
Isolating the issue to one or more folders will help you determine a strategy to reduce the 'bloat' associated with this process.
As a general rule—particularly if you are not thoroughly familiar with the processes involved—you should do little if anything with the SyncServices folder, as the slightest change in its contents can cause catastrophic difficulties with the framework, and result in the loss of data across all of your associated applications, devices and servers. That's why, in rather simplistic terms, Apple warns users to stay away from it.
