Recover data from an former nextcloud storage medim

Dear Nextcloud Community

After about one year of no maintenance, I turned back on my RaspberryPi Nextcloud installation. I had issues reaching it in my local network for a longer time by now and after a quick examination it was clear that the image on the SD card was broken.

My Plan was to renew the image, setup a new Nextcloud installation and need it with the data remaining on the USB stick that I used as storage medium for the system.

As it stands, I am not able to get the USB Stick to work with the new installation, without having to format it. But this is exactly what I do not want to do.

Is there any way of rescuing the data saved on the USB Stick? Lets say by importing it into the new cloud or reading it out in another fashion?

Best regards
Soenke