You should run docassemble from a persistent volume. See Using persistent volumes, docassemble.

I am using Amazon Web Services’s S3 to store my docassemble data. (I set up S3 by following the directions in Using S3 or S3-compatible, docassemble.)

Step 1: Make sure Docker is running:
docker start
sudo service docker start

Step 2: Run Docker from the persistent volume:

docker run --env-file=env.list \
-v dabackup:/usr/share/docassemble/backup \
-d -p 80:80 -p 443:443 --stop-timeout 600 \
jhpyle/docassemble

(I got these instructions from Using persistent volumes, docassemble.)