Newest Wekan v3.x for Docker at master branch has newest Meteor 1.8.x and MongoDB 4.x, it requires mongodump of previous database and restore with added option --noIndexRestore, because of major change of MongoDB from v3.2.x to v4.x. Also please use newest docker-compose.yml from master branch. Devel branch is old with Meteor 1.6.x and MongoDB 3.2.x and it is not developed anymore, and it does not have latest features. See Platforms Upgrade Status for more information.
Backups of Wekan database with mongodump once a day miminum required.
Bugs, updates, users deleting list or card, harddrive full, harddrive crash etc can eat your data. There is no undo yet.
Only newest Wekan is supported. Please report all new bugs immediately.
Wekan on Sandstorm is not affected by any Standalone Wekan (Snap/Docker/Source) security issues.
If you use Standalone Wekan on public Internet, it's better to get automatic security updates with Snap and restore from backup when needed, than to leave old vulnerable manually updated Docker Wekan running.
With Docker Wekan you still need at least daily backups, if some bug causes Wekan board to not load.