All data loss on the web

I installed the server on ubuntu system and it ran normally for several months.
I used the command mount /dev/sdc1 /home/ubuntu/seafile-data to store the data in another disk.

Yesterday, after I restarted the seafile and seahub server, I found there is no data left on the web for all accounts.

I checked the /dev/sdc1 disk and it was normal.

I think there must be some server that I haven’t started successfully so that I can’t see anything on the web.

Can everything help me solve the problem? Thank you.

Are you sure monting worked? Are the permissions correct?