I have to download a 15GB file from my client's system using FileZilla. However the download looks like it will take a very long time, more than one day.
Can I resume the download after restarting my system the next day?
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As others have said it's possible to resume downloads with FileZilla. What they haven't said, however, is that you won't automatically be prompted to resume your download(s) when you launch the program (at least in OSX).
You'll need to reconnect to the server and attempt to download the file you partially downloaded before. You will then see the list of options among which "Resume" will be. Select that and your download will begin where it previously. left off.
Whenever you download a file that already exists on your system, you have control over what happens. The following information comes from the official documentation.
Find this in the
Edit->Settings... menu (for the Windows version). This is the official documentation of these drop-down values:
Ask for action: Ask you what to do every time this occurs.
Overwrite file: Overwrite the destination file every time.
Overwrite file if source file newer: Overwrite the file in the destination if the file being transferred is time-stamped with a later date/time. Note: the date and time on local and remote machines need to be synchronised in order for this to work correctly. If they differ, ensure that you configure the server time offset before transferring files. See Configure server time offset.
Overwrite file if size differs: Overwrite the destination file if there is a size difference between the destination file and the file being transferred.
Overwrite file if size differs or source file is newer: This is a combination of the previous two options. The destination file will be overwritten if there is a size difference between it and the file being transferred, or if the file being transferred is time-stamped with a later date/time.
Note: the date and time on local and remote machines need to be synchronised in order for this to work correctly. If they differ, ensure that you configure the server time offset before transferring files. See Configure server time offset.
Resume file transfer: Assume that a previous file transfer was stopped mid-transfer, and continue transferring the file. This option is particularly useful when large files are being transferred or the connection is slow or unreliable.
Rename file: Transfer the file, but don’t overwrite the existing destination file; instead, dialog box is presented where the user can enter the new name for the file being transferred:
Skip file: Don’t transfer the file. Skip to the next file in the queue instead.
To change the ‘file exists’ behaviour for the existing session – ie, the behaviour will revert to the default when you next open FileZilla Pro:
[This one is usually the least convenient in my opinion.] To change the ‘file exists’ behaviour for all files currently queued to be transferred to or from a specific server: