Occasionally, syncing my iDisk would result in error -8088. Google shows a few forum posts by other people having this problem but so far, no solution has been found.
According to ~/Library/Logs/MirrorAgent.log:
*** Syncing “zr40_iDisk”
copyCallback: got error -8088 at stage 3.
/SourceCache/FileSync/FileSync-99.9.7/Agent/Engine/syncio.m,765 err -8088 (cpfile)
/SourceCache/FileSync/FileSync-99.9.7/Agent/Engine/syncio.m,70 err -8088 (syncjobaddobj)
*** Exception -8088 logged for “Documents/symlink” ***
-8088 FAIL ADDED —> Documents/symlink
*** Done syncing “zr40_iDisk”
Apparently, iDisk doesn’t support syncing symlinks. As the symlinks I created weren’t really necessary, I removed them.