Endurance Tab (Preferences Dialog)

WinSCP is able to store file being transferred to temporary filename first, renaming it to the target name only once the transfer successfully finishes.

There are two reasons to do that:

• If the transfer is interrupted, on the next attempt (either manual or automatic), WinSCP is able to detect the partinal/temporary file and suggest you transfer resuming automatically (or even resume automatically). This is supported with SFTP protocol only. However you can resume transfers also manually.
• While updating an existing file, the original version of the file exists during whole transfer. This is particularly useful when updating frequently accessed file on web sites.

For performance reasons transfer to temporary file name is enabled by default for files larger than a given threshold. The threshold is initially 100 KiB. You can change the threshold. You can also enable the feature for all files, particularly when looking to achieve the second impact. You may also need to disable the feature altogether, particularly if you do not have permissions required (e.g. permissions to create a new file in target directory).

Use the checkbox to enable automatical reconnection of broken transfers. You can also configure how long will WinSCP wait before reconnection attempt. Note that you can always force earlier attempt manually. The setting applies for foreground transfers only. For background transfers the interval is always 2 seconds.