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Profile Settings - Compression
There are two ways of using file compression. You can either
Compress Each File Individually. One zip or sz file will be created for each file that is copied from the left-hand side to the right-hand side. The advantage of this method is that in future synchronizations, the compressed files are fully transparent and they will be shown in the Synchronization Preview as normal files. Since future synchronizations will see the compressed files as normal files, they will know exactly if they are still identical to the left-hand side. When copying these compressed files back (from right to left), they are unzipped automatically.
Use Compressed Packages (Many files per archive). Putting many files in a single backup archive is also possible. However, this is not the native way Syncovery handles files. In future runs, the files inside the Compressed Packages are not seen by the software. Therefore, you may need to resort to the "Archive" flag in order to determine which files are new or changed and need to be backed up. Compressed Packages can also be used in order to speed up file transfer over a small or medium bandwidth network connection. If used that way, the Syncovery Remote Service must be installed on the destination machine and be configured properly.
There are also two file formats for file compression (new in Syncovery 8).
Zip format: a standardized file format to ensure compatibility with many other applications. It offers reasonable compression capabilities. When uploading to a cloud server, or using an Internet protocol such as FTP, Syncovery creates a local temporary zip file first. If you back up large files, you need to make sure that enough temporary file space is available.
Sz format: a new, proprietary file format. This is currently supported only by Syncovery. It is a streaming format that can be used to back up to cloud servers without using any temporary space on your local hard drive. It also features the two Ultrafast and Maximum compression modes which are both better than the zip format. Since Syncovery 9, the Sz archives can contain more than one file, so they are now compatible with the "Compressed Packages" feature.
Both file formats support the same level of encryption, using the AES 256 algorithm.
Compress Each File Individually (when copying left to right)
This method compreses each file individually as described above. The zip or sz file will have the same name, plus a few digits encoding the uncompressed size of the file, plus the .zip or .sz extension. The uncompressed size needs to be encoded in the file name in order to make the compressed file transparent for future synchronizations.
Use Compressed Packages (many files per compressed archive)
This settings enables the use of Compressed Packages as described above. A separate dialog with some related options will appear when this option is chosen.
Compress directly to destination
This applies to ZIP files only. Normally, compressed ZIP files are generated in a temporary folder and then copied to the destination. This setting changes that and generates the ZIP files directly in the destination folder. This setting cannot be used for FTP transfers.
Unpack all Zip or Sz files which are copied to the destination
Normally, the program unpacks only Zip or Sz files when restoring from the right side to the left side, and only those "individually compressed" ones that it has generated itself during a previous run. To unzip any Zip or Sz file after copying it to the other side, use this setting. Both the compressed file and the unpacked files will remain in the destination folder.
Limit Zip File Size
This option allows you to specify a maximum file size for the zip files. When the size is reached,
the program will begin a new split zip file. This works with both the individual zipping mode and the ZIP Package mode.
See also:
Upper Part Of Dialog Box
Advanced Settings