Thank you for the guidance. After some research on Linux-native file systems, I compared ext4 and Btrfs. While Btrfs offers advanced recovery features, ext4 stands out for its proven stability and performance exactly what I need, especially with regular backups in place. My plan is to back up the data twice (as always), format the main 10TB NTFS drive to ext4, then migrate everything back. I'll keep you updated on the process data migration will likely take most of today. Thanks again!

Update 2/24 I initially transferred only a small portion of my data to validate the process before committing to a full migration. After installing the necessary components, I mounted the drive in Windows 11 using Ubuntu via PowerShell with the following command:

wsl --mount \.\PHYSICALDRIVE1 --partition 1

This allowed me to access the drive through File Explorer and complete the initial transfer. While I could have performed this directly within Proxmox, I chose the method I’m more familiar with to avoid potential issues with important media data.

Next, I created a directory in promox and mounted the external drive using:

mount /dev/sdc /mnt/pve/Media

After confirming successful mounting, I updated the configuration files to make the change persistent and verified functionality by restarting the server. I was then able to point my Jellyfin library to the new location and confirm the migrated data was accessible.

With testing complete, I have shut down the Proxmox server and begun transferring the remaining data.