Compression Settings
This settings tab allows you to compress the files in the destination and choose the level of compression. Note that Zip files cannot contain more than 65,535 files and are limited to 4GB in size.
This tab is only displayed in Expert mode. Compression is also not available when the destination is an FTP server.
SyncBack has the ability to compress files in the destination directory, using the standard ZIP format. Compression reduces the size of the file and has the potential to save a lot of disk space, especially when files such as text and office documents are being copied. Two methods of compression are supported: all the files can be placed into one single compressed file, or each file can be placed into it's own individual compressed file. The first option uses the least amount of disk space, but has the disadvantage that "all the eggs are placed in one basket", so to speak.
Compress the files in the destination: Enable this option to compress files copied to the destination directory.
Put all files in the destination folder into a single compressed file: If this option is enabled, then the files will be put into a single compressed archive file in the destination. If this option is not enabled (the default), then each file will be placed into it's own compressed archive file.
Password: If you want to password protect the files in the compressed archive, then enter a password here. It's important to note that if you change the password then the existing files in the destination will still use the old password. Each file in a compressed archive has it's own password.
Filename extension: This option is only available when compressing each file. Enter the filename extension to use for the destination compressed files. By default '.zip' is used.
Level of compression: There are four possible levels of compression: Maximum, Medium, Low, and Normal. The more a file is compressed, the slower it takes to compress the file. This option allows you to make a trade-off between speed and file size.
Temporary directory: By default, temporary files produced during compression are stored in your standard Windows temporary directory. You can however change this using this option. For example, you may be using a small RAM disk as your temporary directory and so when using compression you would like the temporary files stored on your hard drive.
Do not make a local copy...: When using single file compression (i.e. all files are compressed into a single file) then SyncBack will first copy the destination compressed file to the local drive if the destination is a slow device, e.g. removable media, network drive, etc. Work is then done on the copy, and after the profile has finished, this copy replaces the compressed file on the destination. This greatly increases performance, but you may want SyncBack not to do this.
It is important to remember that the ZIP compression format has two limitations:
1. Zip files cannot contain more than 65,535 files.
2. Zip files are limited to 4GB in size.
Neither of these limitations will be a problem if you choose to compress each file to it's own archive instead of compressing all files to a single archive.
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