Do I have to use Dropbox?

Have a Gautier account and iCloud account already. Can I backup to these services?
If so …how do I do it?

You can backup to a local network share or Dropbox. iCloud presents itself as a local drive, which can be shared, there are tricks to do this, but it’s a bit of a kludge - google is your friend. My router has USB ports and I share a usb stick from there for my backups.

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thanks, did as suggested.