stop backup operations

Hi,

Since this very morning I am a very newbie to zextras suite. in trial mode of course.
installation and setting went on smoothly. no problems there.

in ZXbackup I started the initilization. no problems there either. But this first backup is slowing down on the clients operations in zimbra. most of the users use the webinterface and are experience slow connections and/or slow program.

my question: is it safe to stop this first backup and start it again at a more apropriate time in the evening?