How to pause uploading on a certain time?

How to pause uploading on a certain time? If public FTP, where i'm uploading, makes a restart or something every night at 4:15 a.m. and then all the uploads will cancel and uploaders can't overwrite or delete, they can only upload. So i don't want to upload all the time retry files, it's annoying. Is it possible to stop uploading if the next file uploading goes into 4:15 a.m.? Example: if i start uploading at 2:00 RAR archives and one RAR archive will upload during 4:15 (then the program won't even start the upload). So i want to say that the program should know what happens in a few minutes. Yeah, quite bad english, but i hope someone gives a solution.

I still need solution for this. Please someone help.