# articles **URL:** https://forum.duplicati.com/c/articles/16.md [Latest](https://forum.duplicati.com/latest.md) · [Categories](https://forum.duplicati.com/categories.md) · [Tags](https://forum.duplicati.com/tags.md) --- ## [About the articles category](https://forum.duplicati.com/t/about-the-articles-category/17677)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0
This category is reserved for technical articles. It currently hosts the articles that were originally posted on the Duplicati primary site. --- ## [Filters in Duplicati](https://forum.duplicati.com/t/filters-in-duplicati/17679)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 8\ **Last updated:** [February 4, 2026, 11:13pm UTC](https://forum.duplicati.com/t/filters-in-duplicati/17679 "2026-02-04T23:13:20Z")
General Concept of Filters Duplicati 2.0 can include or exclude files and folders from your backup based on so-called filters. A filter can consist of various rules. And a rule decides if a file is to be included to the … --- ## [Explaining the local database](https://forum.duplicati.com/t/explaining-the-local-database/21712)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [December 9, 2025, 9:42am UTC](https://forum.duplicati.com/t/explaining-the-local-database/21712 "2025-12-09T09:42:20Z")
When the local database goes missing: How Duplicati rebuilds, verifies, and recovers your backups Duplicati is built around a simple promise: your data should remain private and secure wherever you store it. That securit… --- ## [Choosing sizes in Duplicati](https://forum.duplicati.com/t/choosing-sizes-in-duplicati/17683)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 8\ **Last updated:** [October 29, 2025, 7:22am UTC](https://forum.duplicati.com/t/choosing-sizes-in-duplicati/17683 "2025-10-29T07:22:39Z")
Choosing Sizes in Duplicati All options in Duplicati are chosen to fit a wide range of users, such that as few as possible of the users need to change settings. Some of these options are related to sizes of various elem… --- ## [Increasing security for Duplicati’s web server](https://forum.duplicati.com/t/increasing-security-for-duplicati-s-web-server/18871)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [August 26, 2024, 6:43pm UTC](https://forum.duplicati.com/t/increasing-security-for-duplicati-s-web-server/18871 "2024-08-26T18:43:04Z")
A key implementation in Duplicati is the use of a web server for controlling a long-running process that contains the data needed for running and managing recurring backups. The web server allows a standard HTTP-based AP… --- ## [Building a new storage backend for Duplicati](https://forum.duplicati.com/t/building-a-new-storage-backend-for-duplicati/18923)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [September 4, 2024, 9:01pm UTC](https://forum.duplicati.com/t/building-a-new-storage-backend-for-duplicati/18923 "2024-09-04T21:01:31Z")
This article covers the design considerations for creating a new backend module for Duplicati extending the destinations possible for storing backup data. The Duplicati project is written in C# so some knowledge of C# is… --- ## [Secure by design: Using hashing and encryption to provide tamper-resistant, verifiable backups](https://forum.duplicati.com/t/secure-by-design-using-hashing-and-encryption-to-provide-tamper-resistant-verifiable-backups/18359)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 3\ **Last updated:** [August 15, 2024, 5:00pm UTC](https://forum.duplicati.com/t/secure-by-design-using-hashing-and-encryption-to-provide-tamper-resistant-verifiable-backups/18359 "2024-08-15T17:00:00Z")
A user recently asked for an overview of Duplicati from a security perspective. Because this information isn’t currently documented in one place, I’m sharing a version of that overview here to explain the different compo… --- ## [How the backup process works](https://forum.duplicati.com/t/how-the-backup-process-works/17682)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 2\ **Last updated:** [June 9, 2024, 8:18pm UTC](https://forum.duplicati.com/t/how-the-backup-process-works/17682 "2024-06-09T20:18:15Z")
Introduction Duplicati is an open source backup application, that has no server-side components and thus it can support a wide variety of cloud-based storage providers. This also means, Duplicati has to handle large late… --- ## [Getting started guide](https://forum.duplicati.com/t/getting-started-guide/17687)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 2:31pm UTC](https://forum.duplicati.com/t/getting-started-guide/17687 "2024-04-03T14:31:00Z")
Introduction Duplicati is an open source backup application, which runs on your local machine, and encrypts data prior to uploading it. The user interface is web-based and allows you to control all the options offered by… --- ## [Windows Drive Letters](https://forum.duplicati.com/t/windows-drive-letters/17686)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 2:09pm UTC](https://forum.duplicati.com/t/windows-drive-letters/17686 "2024-04-03T14:09:35Z")
The Windows Drive Letter Problem If you are a Windows user, you may have noticed that the drive letter Windows assigns can change from time to time. This happens because Windows picks the next available letter and assign… --- ## [Different ways to make a Duplicati backup](https://forum.duplicati.com/t/different-ways-to-make-a-duplicati-backup/17685)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 2:08pm UTC](https://forum.duplicati.com/t/different-ways-to-make-a-duplicati-backup/17685 "2024-04-03T14:08:50Z")
The many (inter-)faces to Duplicati For most users, simply installing Duplicati and running it will provide a simple and easy way to set up a backup. But Duplicati provides more than one way of running a backup, making … --- ## [How the restore process works](https://forum.duplicati.com/t/how-the-restore-process-works/17684)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 2:07pm UTC](https://forum.duplicati.com/t/how-the-restore-process-works/17684 "2024-04-03T14:07:30Z")
Duplicati Restore Process If you have read the How the backup process works document, you might be wondering how the restore process uses the stored data to restore your files. This document explains this process, using … --- ## [Block-based storage engine](https://forum.duplicati.com/t/block-based-storage-engine/17681)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 1:58pm UTC](https://forum.duplicati.com/t/block-based-storage-engine/17681 "2024-04-03T13:58:51Z")
Background In Duplicati 1.3 backups were done and stored the following way: There was always a full backup followed by incremental backups. The latest incremental backup was based on all previous backups. To restore la… --- ## [How we get along with OAuth](https://forum.duplicati.com/t/how-we-get-along-with-oauth/17680)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 1:56pm UTC](https://forum.duplicati.com/t/how-we-get-along-with-oauth/17680 "2024-04-03T13:56:25Z")
The Issue with OAuth Duplicati is a backup tool running in the background. This usually means that there is no way to prompt users for input easily. This gets even more important when the command line interface is used t… --- ## [Fact Sheet for Duplicati](https://forum.duplicati.com/t/fact-sheet-for-duplicati/17678)
**Author:** [@kenkendk](https://forum.duplicati.com/u/kenkendk)\ **Replies:** 0\ **Last updated:** [April 3, 2024, 1:54pm UTC](https://forum.duplicati.com/t/fact-sheet-for-duplicati/17678 "2024-04-03T13:54:02Z")
Basic: Strong Encryption Duplicati uses strong AES-256 encryption to protect your backups. It is designed following the TNO principle: Trust No One. For instance, all data is encrypted locally before it is transferred to…