

Veeam community edition is fine for most things.
If you are cheeky, generate yourself an NFR license on their website.
Edit: Veeam plans a Linux version for VBR 13.
Veeam Agent can run stand-alone on both Linux (only specific distros are actually supported. Non-supported might work) and Windows
I set mine up with Authelia 2FA and restricted media deletion to one user: The administrator.
All others arent allowed to delete. Not even me.