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+## 1) Create Backups first
+
+[Backup](https://github.com/wekan/wekan/wiki/Backup)
+
+Docker data is usually at `/var/lib/docker` or `/var/snap/docker/common/` (in Snap version of Docker).
+
+## 2) No errors of MongoDB ?
+
+- Check does docker-compose.yml have like `mongod --logpath=/dev/null --quiet`. Well, it's very quiet.
+- Just remove logpath, or set it to syslog with `--syslog`.
+- Or add path to somewhere where mongod service has write access, like `--logpath=/var/lib/docker/mongodb.log` or `--logpath=/var/snap/docker/common/mongodb.log`.
+- If you remove `--quiet`, you get even more verbose logs.
+
+## 2) Errors of Wekan connecting to MongoDB ?
+
+Probably did upgrade your kernel. Please reboot.
+
+## 3) Errors about too new or old version of MongoDB ?
+
+Check your docker-compose.yml . Did newer Wekan with newest docker-compose.yml from https://github.com/wekan/wekan have different version of MongoDB? If yes, you should change to that old version. For example:
+```
+docker-compose stop
+```
+Then in docker-compose.yml, `image: mongo:latest` to some other like `image: mongo:3.2` or 3.2.22 or 4.2 or something. Then:
+```
+docker-compose start
+```
+Or alternatively:
+```
+docker-compose up -d
+```
+## 4) Trying to upgrade Wekan?
+
+### 1) [Backup](https://github.com/wekan/wekan/wiki/Backup)
+
+### 2a) Nice way:
+```
+docker-compose stop
+
+docker rm wekan-app
+```
+Then edit docker-compose.yml wekan-app version tag, for example:
+```
+image: quay.io/wekan/wekan:v4.55
+```
+And start Wekan:
+```
+docker-compose up -d
+```
+Done!
+
+### 2b) Brutal way: Destroy all Docker data!
+
+Deletes all containers etc! Clean, empty, data loss possible if you did not backup all Docker containers, and no conflicts when installing.
+```
+git clone https://github.com/wekan/docker-cleanup-volumes
+
+cd docker-cleanup-columes
+
+./start.sh
+```
+If you have Snap version of Docker, you need to add to scripts path of docker command, that is `/snap/bin/docker`.
+
+Get newest docker-compose.yml from https://github.com/wekan/wekan
+
+Start Wekan
+```
+docker-compose up -d
+```
+[Restore](https://github.com/wekan/wekan/wiki/Backup)
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