I'm considering switching from Windows to Linux and want to preserve my projects, software settings, and personal files without buying another drive. My computer has a 512 GB SSD, a 1 TB SSD, and a 1 TB HDD, with less than 500 GB of data to preserve. I can reinstall applications, but I'm more concerned about configuration files and projects. The drives are not encrypted, and I don't currently have another working computer available for backups. My current plan is to leave the Windows SSD untouched, install Linux on the other SSD, and use the HDD to hold backup files. Is this a safe approach, and what should I watch out for?
4 Answers
Leaving Windows installed for now and setting up Linux alongside it is a good beginner-friendly migration path. You can select the Linux disk in your firmware boot menu, while the original Windows installation remains available if you need it. Double-check the target disk and bootloader location during setup; Linux will not protect files on a disk you accidentally choose to erase.
Your plan is reasonable. Put Linux on the SSD you’re willing to erase, and keep the Windows SSD disconnected or untouched during installation. Use the HDD for your personal files and backups. The installer usually only changes the disk you select, but physically unplugging the other drives removes much of the risk of choosing the wrong one.
You don’t need an external drive if you have enough free space across your existing disks. Move important files to the SSD or HDD you’re keeping, install Linux on the other SSD, then copy the files back if needed. Afterward, you can reformat the Linux data drive to a Linux filesystem such as ext4 or Btrfs. Keep in mind that a single copy on one internal disk is not a complete backup.
Linux can generally read existing NTFS partitions, so you can access your Windows files after installing it. However, disable Windows Fast Startup before doing this, since it can leave NTFS volumes in a partially hibernated state. Also verify that BitLocker or any other drive encryption is disabled before wiping or relying on a Windows partition. NTFS is fine for transferring files, but a Linux-native filesystem is usually better for files that Linux applications will actively modify.

That’s what I’m planning: leaving the Windows SSD alone, installing Linux on the other SSD, and using the HDD for both existing files and backups.