• 1) Create Backups first
• 2) No errors of MongoDB ?
• 3) Errors of Wekan connecting to MongoDB ?
• 4) Errors about too new or old version of MongoDB ?
• 5) MongoDB corruption?
• 6) Trying to upgrade Wekan?
• 1) Backup
• 2a) Nice way:
• 2b) Brutal way: Destroy all Docker data!