# Taking a long time for 400GB **URL:** \ **Category:** Support\ **Created:** [October 9, 2017, 12:08am UTC](https://forum.duplicati.com/t/taking-a-long-time-for-400gb/946 "2017-10-09T00:08:05Z")\ **Posts on this page:** 1\ **Showing post:** 8
**Author:** ![kees-z](https://forum.duplicati.com/user_avatar/forum.duplicati.com/kees-z/32/29_2.png) [@kees-z](https://forum.duplicati.com/u/kees-z)\ **Post date:** [October 10, 2017, 10:06am UTC](https://forum.duplicati.com/t/taking-a-long-time-for-400gb/946/8 "2017-10-10T10:06:33Z")
> [@Dan](#): > > How do I run this as a service? I wasn’t able to find it in my Services (well nothing with Duplicati in it). This How-To explains how to migrate Duplicati from a user-based to a service-based setup: > [@Migrating from User to Service install on Windows](https://forum.duplicati.com/t/migrating-from-user-to-service-install-on-windows/660): > > Thanks to @martijnsmith for giving me the boost needed to “how-to” this! If you want to run Duplicati as a Windows service instead of under a specific user account OR maybe you find that you keep getting errors such as the following, it could be that you’re running Duplicati under a user install for a non-administrator user. System.UnauthorizedAccessException: Access to the path '\' is denied. Firstly, congratulations on not doing everyday work as an administrator! slight_smile … This video shows how to register the service after a fresh install: https://www.youtube.com/embed/fZ_ukxbEyG0?feature=oembed&wmode=opaque&list=PL0gtWo1zHMjypJQAP1bcxRkr-lls7uztm > [@Dan](#): > > And lastly, what is VSS? VSS is a technology that enables backup software to make a copy of files that are in use by another process. More information can be found here: > **[Shadow Copy](https://en.wikipedia.org/wiki/Shadow_Copy)** > > Shadow Copy (also known as Volume Snapshot Service, Volume Shadow Copy Service or VSS) is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service. A software VSS provider service is also included as part of Windows to be used by Windows applications. Shadow Copy technology requires either the Windows NTFS or ReFS filesystems i VSS op... --- _[View the full topic](https://forum.duplicati.com/t/taking-a-long-time-for-400gb/946)._