# Backup files only if modification date \> certain date in the past

**URL:** https://forum.duplicati.com/t/backup-files-only-if-modification-date-certain-date-in-the-past/7763
**Category:** Support
**Created:** [August 13, 2019, 7:07pm UTC](https://forum.duplicati.com/t/backup-files-only-if-modification-date-certain-date-in-the-past/7763 "2019-08-13T19:07:48Z")
**Posts on this page:** 1
**Showing post:** 9

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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 16, 2019, 9:21pm UTC](https://forum.duplicati.com/t/backup-files-only-if-modification-date-certain-date-in-the-past/7763/9 "2019-08-16T21:21:37Z")

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To toss in another option for Linux, thanks to the `find` command, you could enumerate the files that meet your criteria, and feed the paths into the [–changed-files](https://duplicati.readthedocs.io/en/latest/06-advanced-options/#changed-files) option. If it chokes on size, do in [–parameters-file](https://duplicati.readthedocs.io/en/latest/06-advanced-options/#parameters-file).

[Real-time backup](https://forum.duplicati.com/t/real-time-backup/263/12) isn’t really what you’re seeking, but the idea of carefully creating a file list is found there.

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