Hi,
It depends on the requirements.
As rmg mentioned the best way is to make sure that the source system generates files with different names.
Do you know with what frequency will you receive the files?
Another (not fail-proof) option would be to setup the File Polling Interval to be less than the mentioned frequency.
This way the files will not have the time to overwrite each other.
#edi#webMethods#Integration-Server-and-ESB