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Persistent Data Overview
The Overleaf Toolkit needs to store persistent data, such as the files required to compile LaTeX projects, and the contents of the MongoDB database. This is achieved by mounting a few directories from the host machine into the docker containers, and writing the data to those directories.
Data Directories
The Overleaf container requires a directory in which to store data relating to LaTeX compiles. This directory is set with the SHARELATEX_DATA_PATH variable in config/overleaf.rc.
The MongoDB container, if it is enabled, requires a directory in which to store it's database files, and the same is true of the Redis container. These directories can also be configured in config/overleaf.rc.
File Permissions
Because docker runs as root, the data directories will end up being owned by the root user, even if the toolkit is being used by a non-root user. This is not a problem, but is worth being aware of, if you intend to alter the persistent data from outside of the containers.
Backups
Documentation for creating a backup on data can be found in the Developer Wiki.