Database that increases at night

1. What is the problem? Be very detailed.

I am on odk central, hosted at digital ocean, my droplet is 55gb of data. Overnight the size of the data explodes to 155gb. I can't find an explanation

2. What app or server are you using and on what device and operating system? Include version numbers.

I use the latest version of docker, installation on ubuntu 20.4. odk central - latest version of odk collect

3. What you have you tried to fix the problem?

4. What steps can we take to reproduce the problem?

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

Could this be backups gone rogue? Did you check the tmp folder?

merci de ta reponse. Comment fait on pour verifier le fichier tmp