Changing data directory breaks backup possibility on snap installation

Hi everyone.

After installing nextcloud via snap I configured the data directory to an external volume. This is great because I can resize this volume.

Now I also do automatic backups every day with nextcloud.export. This worked fine until I changed the data dir. Now I am getting the error:

Exporting database...
Exporting config...
Exporting data...
rsync: change_dir "/var/snap/nextcloud/common/nextcloud/data" failed: No such file or directory (2)
              0 100%    0.00kB/s    0:00:00 (xfr#0, to-chk=0/0)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1196) [sender=3.1.2]
Unable to export data

The only thing I find online is that snap might not be able to handle this and that I should back up the data myself:

That would be really cumbersome and I also think it’s not good practice to split the backups into two parts. Isn’t there another way? Can I not somehow tell snap to change the default path?

Thanks for any help. Very much appreciated.

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For future readers: Seems like there is no solution to this… had to back up my data with a shell script myself