Re: Backing up Linux to Windows 10

Date	2026-03-23 11:06 +0100
Subject	Re: Backing up Linux to Windows 10
Newsgroups	alt.os.linux
References	(1 earlier) <10ppl4t$3jvl5$1@dont-email.me> <xn0pnlcvnap48rw00o@news.individual.net> <10ppvkh$3ncar$1@dont-email.me> <10pq2uc$3occt$1@dont-email.me> <xn0pnm6mebcaaiz00q@news.individual.net>
From	dillinger <dillinger@invalid.not>
Message-ID	<ruf79m-j16a3.ln1@spock.lan> (permalink)
Organization	KPN B.V.

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On 23-03-2026 09:48, Jeff Gaines wrote:
> 
> Moving files from EXT4 (Linux native) to exFAT (portable file system)
> often causes mistaken timestamp changes due to fundamental differences
> in how these file systems handle time precision, time zones, and
> metadata. When backup software compares the files, these differences can
> make identical files appear to have been modified.
> 
> Here are the primary things that could go wrong to cause a mistaken
> timestamp change detection:
> 1. Timestamp Resolution Mismatch (Rounding Errors)
> The Problem: EXT4 supports nanosecond-level timestamp precision. exFAT,
> however, has a 2-second resolution for file modification times (rounding
> up or down).
> The Mistake: If a file on EXT4 was last modified at 10:00:01, it might
> be rounded to 10:00:00 or 10:00:02 on exFAT.
> Detection Result: When a backup tool (like rsync or FreeFileSync) re-
> scans the files, it sees a 1-second difference and incorrectly concludes
> the file has changed, causing an unnecessary re-copy.

rsync has a workaround for that, from man rsync:

--modify-window=NUM, -@

When comparing two timestamps, rsync treats the timestamps as being
equal if they differ by no more than the modify-window value. This is
normally 0 (for an exact match), but you may find it useful to set this
to a larger value in some situations. In particular, when transferring
to or from an MS Windows FAT filesystem (which represents times with a
2-second resolution), --modify-window=1 is useful (allowing times to
differ by up to 1 second).

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Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-22 15:20 +0000
  Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-22 14:06 -0400
  Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-22 20:58 +0000
    Re: Backing up Linux to Windows 10 Richard Kettlewell <invalid@invalid.invalid> - 2026-03-22 21:08 +0000
      Re: Backing up Linux to Windows 10 Dan Purgert <dan@djph.net> - 2026-03-31 00:07 +0000
    Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-22 17:51 -0400
    Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-22 21:59 +0000
      Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-22 23:57 +0000
        Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-22 20:53 -0400
          Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-23 01:30 +0000
            Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-22 21:59 -0400
              Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-23 02:07 +0000
              Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-03-23 03:35 +0100
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-22 23:46 -0400
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-23 04:43 +0000
                Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-03-23 11:03 +0100
          Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-23 08:48 +0000
            Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-23 09:56 +0000
              Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-23 07:37 -0400
              Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-24 01:24 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-03-24 00:31 -0400
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-24 05:37 +0000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-24 08:38 +0000
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-24 09:20 +0000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-24 09:46 +0000
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-04 05:44 +0000
                Re: Backing up Linux to Windows 10 rbowman <bowman@montana.com> - 2026-03-24 17:46 +0000
            Re: Backing up Linux to Windows 10 dillinger <dillinger@invalid.not> - 2026-03-23 11:06 +0100
        Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-23 08:42 +0000
          Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-23 19:12 +0000
            Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-23 22:00 +0000
              Re: Backing up Linux to Windows 10 vallor <vallor@vallor.earth> - 2026-03-23 23:17 +0000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-24 08:46 +0000
              Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-03-24 01:01 +0000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-03-24 08:44 +0000
                Re: Backing up Linux to Windows 10 vallor <vallor@vallor.earth> - 2026-03-24 15:57 +0000
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-04 05:42 +0000
  Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-14 12:30 +0000
    Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-14 09:51 -0400
      Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-14 15:04 +0000
      Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-14 21:58 +0000
        Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-15 07:44 +0000
          Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-15 04:53 -0400
            Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-15 12:31 +0000
              Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-15 09:42 -0400
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-15 14:25 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-16 05:50 -0400
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-16 09:53 +0000
                Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-16 12:35 +0200
                Re: Backing up Linux to Windows 10 Richard Kettlewell <invalid@invalid.invalid> - 2026-04-16 20:37 +0100
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-20 00:23 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-20 04:31 -0400
                Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-20 12:06 +0200
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-21 01:08 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-21 08:04 -0400
                Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-21 22:52 +0200
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-21 21:19 +0000
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-21 22:13 +0000
              Re: Backing up Linux to Windows 10 Daniel70 <daniel47@nomail.afraid.org> - 2026-04-16 00:04 +1000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-15 14:23 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-16 06:05 -0400
                Re: Backing up Linux to Windows 10 Daniel70 <daniel47@nomail.afraid.org> - 2026-04-16 20:16 +1000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-16 08:53 -0400
    Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-14 15:51 +0200
      Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-14 11:01 -0400
        Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-14 20:39 +0200
        Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-14 21:56 +0000
          Re: Backing up Linux to Windows 10 "Carlos E.R." <robin_listas@es.invalid> - 2026-04-15 10:57 +0200
            Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-15 07:06 -0400
    Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-14 21:55 +0000
      Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-15 07:40 +0000
        Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-15 04:55 -0400
        Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-15 22:18 +0000
          Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-16 07:38 +0000
            Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-16 07:55 +0000
              Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-16 08:40 +0000
                Re: Backing up Linux to Windows 10 Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-16 09:03 +0000
                Re: Backing up Linux to Windows 10 "Jeff Gaines" <jgnewsid@outlook.com> - 2026-04-16 09:06 +0000
                Re: Backing up Linux to Windows 10 Paul <nospam@needed.invalid> - 2026-04-16 06:40 -0400

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