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SQLAlchemy backup/dump tool for Flask

Project description

AlchemyDumps Latest release

Development Status: Alpha Python Version GitHub Actions Coverage Status

Do you use Flask with SQLAlchemy? Wow, what a coincidence!

This package lets you backup and restore all your data using SQLAlchemy dumps() method.

It is an easy way (one single command, I mean it) to save all the data stored in your database.

You can save it locally or in a remote server via FTP.

WARNING @baumatron've found an important bug: at this time this package won't backup non-standard mappings, such as many-to-many association tables. This is still an open issue and I have no expectation to fix is in the following weeks — pull requests are more tham welcomed.


First install the package: pip install Flask-AlchemyDumps

Then pass your Flask application and SQLALchemy database to it.

For example:

  • The second line imports the object from the package.
  • The last line instantiates AlchemyDumps for your app and database.
from flask import Flask
from flask_alchemydumps import AlchemyDumps
from flask_sqlalchemy import SQLAlchemy

# init Flask
app = Flask(__name__)

# init SQLAlchemy and Flask-Script
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///app.db'
db = SQLAlchemy(app)

# init Alchemy Dumps
alchemydumps = AlchemyDumps(app, db)

Remote backup (via FTP)

If you want to save your backup in a remote server via FTP, just make sure to set these environment variables replacing the placeholder information with the proper credentials:

export ALCHEMYDUMPS_FTP_PATH=/absolute/path/

If you want, there is a .env.sample inside the /tests folder. Just copy it to your application root folder, rename it to .env, and insert your credentials.

Using application factory

It is possible to use this package with application factories:

alchemydumps = AlchemyDumps()

def create_app(settings):
    alchemydumps.init_app(app, db)


You might want to add alchemydumps/ to your .gitignore. It is the folder where AlchemyDumps save the backup files.


Considering you have these models — that is to say, these SQLAlchemy mapped classes:

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(140), index=True, unique=True)
    posts = db.relationship('Post', backref='author', lazy='dynamic')

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(140))
    content = db.Column(db.UnicodeText)
    author_id = db.Column(db.Integer, db.ForeignKey(''))

Just in case: this is a simple example, but you can use abstract mapped classes as well.

You can backup all your data

python alchemydumps create


==> 3 rows from User saved as /vagrant/alchemydumps/db-bkp-20141115172107-User.gz
==> 42 rows from Post saved as /vagrant/alchemydumps/db-bkp-20141115172107-Post.gz

You can list the backups you have already created

python alchemydumps history


==> ID: 20141114203949 (from Nov 15, 2014 at 17:21:07)

==> ID: 20141115140629 (from Nov 15, 2014 at 14:06:29)

You can restore a backup

python alchemydumps restore -d 20141115172107


==> db-bkp-20141115172107-User.gz totally restored.
==> db-bkp-20141115172107-Post.gz totally restored.

You can delete an existing backup

python alchemydumps remove -d 20141115172107


==> Do you want to delete the following files?
==> Press "Y" to confirm, or anything else to abort: y
    db-bkp-20141115172107-User.gz deleted.
    db-bkp-20141115172107-Post.gz deleted.

And you can use the auto-clean command

The autoclean command follows these rules to delete backups:

  • It keeps all the backups from the last 7 days.
  • It keeps the most recent backup from each week of the last month.
  • It keeps the most recent backup from each month of the last year.
  • It keeps the most recent backup from each remaining year.
python alchemydumps autoclean


==> 8 backups will be kept:

    ID: 20130703225903 (from Jul 03, 2013 at 22:59:03)

    ID: 20120405013054 (from Apr 05, 2012 at 01:30:54)

    ID: 20101123054342 (from Nov 23, 2010 at 05:43:42)

    ID: 20090708100815 (from Jul 08, 2009 at 10:08:15)

    ID: 20081208191908 (from Dec 08, 2008 at 19:19:08)

    ID: 20070114122922 (from Jan 14, 2007 at 12:29:22)

    ID: 20060911035318 (from Sep 11, 2006 at 03:53:18)

    ID: 20051108082503 (from Nov 08, 2005 at 08:25:03)

==> 11 backups will be deleted:

    ID: 20120123032442 (from Jan 23, 2012 at 03:24:42)

    ID: 20101029100412 (from Oct 29, 2010 at 10:04:12)

    ID: 20100526185156 (from May 26, 2010 at 18:51:56)

    ID: 20100423085529 (from Apr 23, 2010 at 08:55:29)

    ID: 20081006074458 (from Oct 06, 2008 at 07:44:58)

    ID: 20080429210254 (from Apr 29, 2008 at 21:02:54)

    ID: 20080424043716 (from Apr 24, 2008 at 04:37:16)

    ID: 20080405110244 (from Apr 05, 2008 at 11:02:44)

    ID: 20060629054914 (from Jun 29, 2006 at 05:49:14)

    ID: 20060329020048 (from Mar 29, 2006 at 02:00:48)

    ID: 20050324012859 (from Mar 24, 2005 at 01:28:59)

==> Press "Y" to confirm, or anything else to abort. y
    db-bkp-20120123032442-User.gz deleted.
    db-bkp-20120123032442-Post.gz deleted.
    db-bkp-20101029100412-User.gz deleted.
    db-bkp-20101029100412-Post.gz deleted.
    db-bkp-20100526185156-User.gz deleted.
    db-bkp-20100526185156-Post.gz deleted.
    db-bkp-20100423085529-User.gz deleted.
    db-bkp-20100423085529-Post.gz deleted.
    db-bkp-20081006074458-User.gz deleted.
    db-bkp-20081006074458-Post.gz deleted.
    db-bkp-20080429210254-User.gz deleted.
    db-bkp-20080429210254-Post.gz deleted.
    db-bkp-20080424043716-User.gz deleted.
    db-bkp-20080424043716-Post.gz deleted.
    db-bkp-20080405110244-User.gz deleted.
    db-bkp-20080405110244-Post.gz deleted.
    db-bkp-20060629054914-User.gz deleted.
    db-bkp-20060629054914-Post.gz deleted.
    db-bkp-20060329020048-User.gz deleted.
    db-bkp-20060329020048-Post.gz deleted.
    db-bkp-20050324012859-User.gz deleted.
    db-bkp-20050324012859-Post.gz deleted.

Requirements & Dependencies

AlchemyDumps is tested and should work with Python 3.6+.


If you wanna run the tests for the current Python version:

poetry install
poetry run nosetests

We also use some style and quality checkers:

poetry run black . --check
poetry run flake8 flask_alchemydumps/ tests/

If you wanna cover all supported Python version, you need them installed and available via pyenv. Then just poetry run tox.

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