Ios backup on linux

Is there a way to do backups for ios on linux? I know you’ll say ditch them, but we have (2) iphones and (3) ipads and are not going to ditch them at the moment. We currently have a mac with macos that does the backups, but am running out of HD space for new backups. I do have PopOS running on a mac with 1TB HD, but without iTunes available, I’m not sure how to do it?