# Complete backup of 1TB, now taking endless time, reading whole files again

**URL:** <https://forum.duplicati.com/t/complete-backup-of-1tb-now-taking-endless-time-reading-whole-files-again/7839>\
**Category:** Support\
**Created:** [August 20, 2019, 6:00pm UTC](https://forum.duplicati.com/t/complete-backup-of-1tb-now-taking-endless-time-reading-whole-files-again/7839 "2019-08-20T18:00:29Z")\
**Posts on this page:** 1\
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**Author:** ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678)\
**Post date:** [August 21, 2019, 6:07pm UTC](https://forum.duplicati.com/t/complete-backup-of-1tb-now-taking-endless-time-reading-whole-files-again/7839/2 "2019-08-21T18:07:04Z")

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The [–disable-filetime-check](https://duplicati.readthedocs.io/en/latest/06-advanced-options/#disable-filetime-check) documentation doesn’t say what it really does, but the code has this opinion:

> <https://github.com/duplicati/duplicati/blob/193a1a3ac34049c545eb52885b65fe8723dd5156/Duplicati/Library/Main/Operation/Backup/FilePreFilterProcess.cs#L90-L92>

which (if correct) means it will make things worse. Does File Explorer show any recent modified dates?

You can find exactly what it thinks about a given file if you use verbose logging to show file exam results.

[Backups take very long with large data sets](https://forum.duplicati.com/t/backups-take-very-long-with-large-data-sets/7717/2) shows sample output and how you might set up the logging.

Does it show files going by in the GUI? If not, your I/O might be something other than it reading your files.

For a high-tech way of seeing what it’s actually doing on disk, you can use [Sysinternals Process Monitor](https://docs.microsoft.com/en-us/sysinternals/downloads/procmon).

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