Backup between (unRAID) servers

What do you all use to backup between two (unRAID) servers?

I’m interested in this two between off-site Unraid

My plan is to keep personal backups at work and work backups at home.

I would be fine with Grsync, but I don’t think it’s an option.

Filezilla could also be an option, that’s what I used thus far locally and I think it would work with zerotier to think it’s on the same network for remote site to site backups.

Also want automatic backups to Unraid for my Windows work machines