Back up fxbot

fxbot backs itself up before a release's migrations run, into /var/lib/fxbot/backups, and keeps the last five. To keep a copy of your own, off the machine, back up three things: the database, the chat files, and the key.

These steps are for an install made by setup.sh. Run them in a folder only you can read, since the database holds every chat.

Back up

Stop fxbot, so the database and the chat files match:
```
sudo systemctl stop fxbot
```

Copy the database, in pg_dump's custom format, and the chat files:

sudo -u fxbot pg_dump --format=custom fxbot > fxbot.dump
sudo tar -czf fxbot-data.tar.gz -C /var/lib/fxbot/data .

Start fxbot again:
```
sudo systemctl start fxbot
```
Copy the key, and store it apart from the other two:
```
sudo cp /etc/fxbot/secret.key fxbot-secret.key
```
The database holds keys and tokens sealed with it, so they can't be opened without it. Anyone with both can open them.

Restore

On a new machine, first install the same release with setup.sh, then put the key back:

sudo install -o fxbot -g fxbot -m 400 fxbot-secret.key /etc/fxbot/secret.key

Then restore the database and the chat files:

sudo systemctl stop fxbot
sudo -u fxbot pg_restore --clean --if-exists -d fxbot < fxbot.dump
sudo tar -xzf fxbot-data.tar.gz -C /var/lib/fxbot/data
sudo systemctl start fxbot