How do I restore Save Data backups on PlayStation to troubleshoot Rocket League Load Failure errors?

To download the save file backup from cloud storage:

PS5

Select Settings from the Main Menu.
Select Saved Data and Games/Apps Settings
Select Saved Data
Select Cloud Storage
Choose Rocket League
Select Download to Console Storage

PS4

Select your local user
Select Settings
Select Application Data Management
Select Saved Data in Online Storage
Select Download to System Storage
Select Rocket League

This will recover the Replays, Training Sequences, Video Settings, and Tutorial Completion Data.

If you see a message that says, "Do you want to overwrite this saved data?" you are downloading a file that already exists in the PlayStation System Storage. Compare the dates and times shown on the System Storage and Online Storage versions. Make sure you are downloading the older file from Online Storage. Once you know which file you want to save, select from the following options:

Select Yes to replace the version in system storage.
Select No to cancel the download.

If you are trying to solve Rocket League Load Failure errors on PlayStation and this did not help, try the next step: How do I reinstall Rocket League on PlayStation 5? or How do I reinstall Rocket League on Playstation 4?