We detected that if we backup (incremental backup) some mailbox and time of backup can be around one minute which is absolutely ok, so backup copy job copies this mailbox more than 30 minutes.
We have about 30 mailboxes with this behavior.
We tried to investigate where is the problem and found that if user has more folders in his mailbox, then backup copy job needs more time (backup job not, it is quick... only backup copy job).
Here few examples:
User1: Backup time: 3 minutes, Copy time: 45minutes (folders: 5050, new items: 0)
User2: Backup time: 1 minute, Copy time: 35 minutes (folders: 2075, new items: 5)
User3: Backup time: 2 minutes, Copy time: 1 hour (folders: 2345, new items: 21)
User4: Backup time: 1 minute, Copy time: 55 minutes (folders: 1262, new items: 19)
etc...


Normal users with up to 100 folders have copy time up to 30 seconds...
do somebody have the similar behavior?