Why iPhone restore backups from iTunes will reduced my PC space?

When I restoring my backup from iTunes, I saw my C drive space keep reduce until it low of space and can't complete my iPhone restore backup.
Because it is copy out data move to my phone. No understand why it can reduced my PC space?

I'd guess the backup as stored is a compressed file and all the individual components in it must be extracted before being transferred to the phone.

Run ccleaner first and afterward, it should get rid of all the temporary stuff programs leave around…
The free version is fine:
https://www.piriform.com/...r/download

Check with WinDirStat to see what's taking up space

All the needed files and folders have to be move over to the iPhone first before the restore takes place… You do not have enough room for that…

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