Not enough storage to restore iTunes backup

I've backed my iPhone up on iTunes before deleting all of its data, and my PC had 60GB free, the backup had a size of about 50GB plus the 4,9GB of iOS 14 updates due to the DFU mode restart, so I thought it was enough.I backed it up normally, but when my phone was in the hello page, I tried restoring the iTunes update back to it but turns out I need DOUBLE the space to restore it back to my iPhone, due to cache. I got 9GB free on my PC but I need more 50GB on it to restore my backup and it doesn't make any sense! I don't want to lose my iPhone data and my PC doesn't have more storage, and it's weird needing storage on the computer to restore the backup to THE IPHONE, not the computer. I need help with finding alternative ways of restoring my data into my iPhone, and I can't move it elsewhere because my computer doesn't have another drive.

The error says: "iTunes could not restore the backup to the iPhone because an error occured while reading or writing the iPhone"