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ui_synchronize 2022-11-10		ui_synchronize 2024-02-15 (current)
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	With //File size// checked two files are considered different when they have different sizes. The option is not available with //Both// direction selected. When using the option, you should avoid [[transfer_mode\|text transfer mode]] as it may change the file size.		With //File size// checked two files are considered different when they have different sizes. The option is not available with //Both// direction selected. When using the option, you should avoid [[transfer_mode\|text transfer mode]] as it may change the file size.

-	When both options are checked, //Modification time// has higher priority. As a consequence, in the default //Synchronize files// [[task_synchronize_full#mode\|synchronization mode]], a file is not considered updated, despite having different size, if the source file is older than the destination file.	+	With //Checksum// checked two files are considered different when they have different checksums. The option is not available with //Both// direction selected. Requires [[protocols#checksum\|support for calculating checksum]]. SHA-256 checksum is used by default, with automatic fallback to SHA-1, when not supported.

-	When neither option is checked, existing files are considered the same always. So only new files are synchronized.	+	When //Modification time// is checked along with any other the other two, it has higher priority. As a consequence, in the default //Synchronize files// [[task_synchronize_full#mode\|synchronization mode]], a file is not considered updated, despite having different size or checksum, if the source file is older than the destination file.

-	With //Both// direction selected, //Modification time// is always checked and //File size// unchecked.	+	When no option is checked, existing files are considered the same always. So only new files are synchronized.
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		+	With //Both// direction selected, //Modification time// is always checked and the other criteria are unchecked.

	For //Synchronize timestamps// mode checkbox //Same size only// is available. It makes WinSCP update timestamp of the files, that have same size in both directories, only. The mode is available with [[sftp\|SFTP protocol]] only.		For //Synchronize timestamps// mode checkbox //Same size only// is available. It makes WinSCP update timestamp of the files, that have same size in both directories, only. The mode is available with [[sftp\|SFTP protocol]] only.