ssh would be needed, yes.
I do hope you set it up?
Then if you are only interested in the contacts, see here:
else follow juiceme and rsync whole nemo directory.
If ssh not possibke then you need the ‘hard way’ with recovery shell:
https://jolla.zendesk.com/hc/en-us/articles/360002996893-Xperia-devices-How-to-use-the-Recovery-Mode?mobile_site=true