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You can back to another drive, or use a cloud storage service like, Google Drive, iCloud, OneDrive, or Dropbox.
Because formatting the drive will delete all of your data, make a backup of anything you want to keep. If you have specific instructions to use FAT32 and your drive is larger than 2GB, you'll need a third-party tool to format it as FAT32-continue with this method. If your drive is larger than 2TB and you just want to use it to share files between multiple modern operating systems (Windows 8 and later, macOS X 10.6.6 and later), use this method instead, and be sure to select exFAT as the file system type. SuperDiskFormatter is a lightweight tool that provides a simple way to format disks, change the file system, force dismount partitions and change the new volume label. If your drive is larger or you need to work with big files, it's better to use exFAT, which has almost identical compatibility. The main difference is that you can't work with files larger than 4GB on FAT32, nor can it work with drives larger than 2TB. ExFAT, the successor to FAT32, also works on Windows, macOS, Linux, and other devices.