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-<!doctype html>
-<html lang="en">
-<head>
- <meta charset="utf-8">
- <link rel="stylesheet" type="text/css" href="base.css" >
- <title>Comparison Settings</title>
-</head>
-
-<body>
- <h1>Comparison Settings</h1>
- <p>
- <img src="../images/comparison-settings.png" alt="Comparison settings dialog">
- <br><br>
- </p>
-
- <h2>Comparison variants</h2>
- <p>
- When comparing two folders, FreeFileSync analyses the <b>paths relative to the left and right base folders</b> of the contained files.
- If the relative path matches, FreeFileSync decides how the file pair is categorized by considering the selected comparison variant:
- </p>
-
- <b>I. Compare by <i>File time and size</i></b>
- <p>
- This variant considers two files equal when both <b>modification time and file size</b> match.
- It should be selected when synchronizing files with a backup location.
- Whenever a file is changed, its file modification time is also updated.
- Therefore, a comparison by <i>File Time and size</i> will detect all files that should be synchronized.
- The following categories are distinguished:
- </p>
- <ol style="list-style: upper-roman">
- <li><b>file exists on one side only</b>
- <ul>
- <li>left only
- <li>right only
- </ul>
-
- <li><b>file exists on both sides</b>
- <ol style="list-style: lower-roman">
- <li><b>different date</b>
- <ul>
- <li>left newer
- <li>right newer
- </ul>
- <li><b>same date</b>
- <ul>
- <li>equal
- <li>conflict (same date, different size)
- </ul>
- </ol>
- </ol>
- <br>
-
- <b>II. Compare by <i>File content</i></b>
- <p>
- Two files are marked as equal if they have <b>identical content</b>.
- This variant should be selected when doing consistency checks to see if the files on both sides are bit-wise identical.
- Naturally, it is the slowest of all comparison variants, so its usefulness for the purpose of synchronization is limited.
- If used for synchronization, it can serve as a fallback when modification times are not reliable. For example
- certain mobile phones and legacy FTP servers do not preserve modification times, so the only way to detect different files when the
- file sizes are the same is by reading their content.
- </p>
- <ol style="list-style: upper-roman">
- <li><b>file exists on one side only</b>
- <ul>
- <li>left only
- <li>right only
- </ul>
-
- <li><b>file exists on both sides</b>
- <ul>
- <li>equal
- <li>different content
- </ul>
- </ol>
- <br>
-
- <b>III. Compare by <i>File size</i></b>
- <p>
- Two files are considered equal if they have the <b>same file size</b>.
- Since it's possible for files that have the same size to have different content, this variant should only be used when file modification times are not
- available or reliable, e.g. in certain MTP and FTP synchronization scenarios, and where a comparison by content would be too slow.
- </p>
- <ol style="list-style: upper-roman">
- <li><b>file exists on one side only</b>
- <ul>
- <li>left only
- <li>right only
- </ul>
-
- <li><b>file exists on both sides</b>
- <ul>
- <li>equal
- <li>different size
- </ul>
- </ol>
- <br>
-
- <h2>Symbolic Link Handling</h2>
- <p>
- FreeFileSync lets you choose to include symbolic links (also called symlinks or soft links)
- when scanning directories rather than skipping over them. When included, you can select between two ways to handle them:
- </p>
-
- <ol>
- <li><b>Follow:</b>
- Treat symbolic links like the object they are pointing to. Links
- pointing to directories are traversed like ordinary directories and
- the target of each link is copied during synchronization.<br>&nbsp;
-
- <li><b>Direct:</b>
- Evaluate the symbolic link object directly. Symbolic links will be shown as separate entities.
- Links pointing to directories are not traversed and the link object itself
- is copied during synchronization.
- </ol>
- <br>
-
- <div class="bluebox">
- <b>Note</b>
- <ul style="margin: 0">
- <li>Under Windows the symbolic link options apply to symbolic links, volume mount points and NTFS junction points.
- <li>Copying symbolic links requires FreeFileSync to be started with administrator rights.
- </ul>
- </div>
-
-</body>
-</html>
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