What to backup

Vikunja does not store any data outside of the database. So, all you need to backup are the contents of that database and maybe the config file.

MySQL

To create a backup from mysql use the mysqldump command:

mysqldump -u <user> -p -h <db-host> <database> > vkunja-backup.sql

You will be prompted for the password of the mysql user.

To restore it, simply pipe it back into the mysql command:

mysql -u <user> -p -h <db-host> <database> < vkunja-backup.sql

SQLite

To backup sqllite databases, it is enough to copy the database elsewhere.