What’s needed for a clean install on a Mac A backup of the disk before it’s erased. Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that. Here is a detailed guide for the process.  A Mac operating system installer. MacOS Big Sur can be downloaded by clicking here.   Mac Free  Uninstallation: All of the apps on MacDaddy are fully self contained and easy to uninstall. Just drag and drop the application to the trash in the Finder.  If you need to recover deleted files take a look at Mac Data Recovery Guru on our sister-site dedicated to data recovery. Follow @BenedictSlaney   Paypal / credit card donations: click here Bitcoin donations: 1MbwUFSbQvMrd826DTpup7PpTTNrrJjaJ8 Total downloads: 1,678,418 Total donated: $33.99