NWCONFIG-X-350: The total space required by files that will be copied (number MB; number bytes) is larger than the free space available on the system volume (number MB; number bytes). Because some files may be overwritten and replaced, you may have sufficient space, but that cannot be determined at this point.
You may want to do one or more of the following: Select fewer file groups (if applicable), delete files, purge deleted files, or expand the size of system volume SYS: (by recreating it or adding an additional volume segment).
Source: NWCONFIG.NLM
Explanation: If you are replacing files with this copy operation (that is, if the files you are copying already exist on the server), then you might have enough space.
Action: If sufficient space is available, continue with the operation; otherwise, follow the instructions in the message.