Comment by CTDOCodebases

It's more the single drive storage layout that is an issue in your case. No resilience to a single disk failing and you are risking all your data if your hardware starts silently corrupting data. This is assuming all your backups are done using the data on the single hard drive.

If you want to keep your setup simple I would consider the following:

- Keep a list of file hashes and check your files against this list periodically.

- Use some type of backup program that supports snapshots. Restic is a good choice.

- Get a hard drive the same size as the one you have and use SnapRAID to manage file integrity or set up a two disk mirror using btrfs.