add to docs: webODM data/projects?

[danbjoseph]

• does webodm store on the file system or inside the docker image?
• does data persist after a system reinstall? if not, what folders are important to backup
  for each service (OpenMapKit, OSM data, WebODM projects)?
• is there a way to "import" WebODM projects after a system reinstall so they appear in the system interface again?

[mojodna]

WebODM stores assets on the filesystem in /opt/data/webodm: https://github.com/posm/posm-build/blob/821ee4464d8573d984757cbf5db5efd3370ee2c6/kickstart/etc/systemd/system/webodm-web.service.hbs#L22 This is also available via smb://posm/webodm.

Data does not persist when installing. Backups are made by /opt/admin/posm-admin/scripts/backup-data.sh in posm-admin: https://github.com/posm/posm-admin/blob/39039ed/scripts/backup-data.sh

Backups must be initiated manually by visiting http://posm.io/posm/admin. Backups are written to /opt/data/backups on POSM (and are available via smb://posm/backups)

To import WebODM projects on a newly-provisioned device, populate /opt/data/webodm with the contents from the device being imported from and import /opt/data/backups/webodm/webodm-<timestamp>.sql.gz into Postgres.