Is it safe to suspend clonezilla while data is transferring?

I am trying to do an image backup of an entire disk to an external drive that has limited space using a clonezilla liveusb. In order to not run out of space I started offloading data to another computer, but that was taking too long so I decided to ctrl+z the transfer process. Once I was comfortable that there was enough space I sent SIGCONT to all the processes that I assumed belong to clonezilla that had the T flag (which means it was stopped by job control signal). After that, other than the progress screen being unreadable, the parts of the screen that show progress continue be readable and the space continues to grow as before I stopped clonezilla. Is this safe to do and is the backup corrupted and I shouldn't waste my time waiting for the backup to finish so that clonezilla checks if the image is restorable? I may have to do this again soon as I'm running out of space rapidly. The reason why I'm not just stopping and swapping disks and restarting is because this already took a long time to get to the point it's at and I don't have a lot of spare disks that I'm able to delete data and use at the moment.