Parallel Offloading

Offloading is the process of adding clips from a camera, field recorder or storage device to the Silverstack library and copy them onto one or several backup disks. In order to make it possible you can follow this directions:


Prepare for offloading

First of all you have to assign clips to a project. You can select a project or a folder from the library tree in the left panel before starting. This way you will be able to set your offload destination in Silverstack’s library.

A new bin containing the offloaded clips will be created inside this project. It will have the same name as the source volume from which the clips have been offloaded. If the current selection in the library tree is a bin, a new bin will be created as a sibling of the selected one.


Starting to offload


figure 1: offload source selection

figure 1: offload source selection


After mounting the camera storage that you want to offload, you have several options to achieve that:

  • Click on the “Offload” icon in Silverstack’s toolbar and select the volume you want to offload from.
  • Choose Library > “Offload” from the Silverstack menu.
  • Right click on a folder in the library tree (left panel) and choose “Offload” from the drop down menu.
  • Drag the folder or card from the finder to Silverstack’s icon in the Dock window.

Using the options 2 and 3 a directory browser will open and you’ll need to select the volume or folder you want to offload from.



Offload Wizard

The “Offload” wizard (figure 2) will try to detect the used camera automatically. After scanning the chosen offload device, all found files will be shown in a table. If, in an exception, Silverstack should not choose the right camera format, you can simply change that by clicking on the camera selection button (figure 2 #1). The import options for the multiple camera types can be found and edited in the application preferences.

figure 2: selecting clips to offload

figure 2: selecting clips to offload

By default Silverstack will offload all the clips and sidecar documents contained in the device you have chosen. To edit the import options, click on the «Edit» button. If you want to offload only a subset of clips, you will have to check the “Allow partial offload” option (figure 2 #2). Clips can be marked and unmarked either by using the check-boxes or the mark and unmark buttons (figure 2 #3) above the search field. Therefore either select all clips you want to import and then click on “Mark Only Selected” or select those clips of all already marked that shall not be imported and click on “Unmark Selected”.

As you can see in figure 3 there is a bunch of keyboard shortcuts for marking (#1) and unmarking (#2) clips to facilitate this task.

figure 3: marking clips to offload

figure 3: marking clips to offload

Silverstack is prospecting for duplicates – clips already existing in the library – and prevents them by default from being offloaded. If you want to include those nonetheless, mark the checkbox “Allow import of duplicates” (figure 2 #4).

Sometimes Silverstack will skip some hidden files and empty folders as in figure 4. If you click “Learn More”, a window will pop up showing which files are ignored.

figure 4: skipped files warning

figure 4: skipped files warning

You are able modify this behavior in Silverstack’s Ingest preferences menu. In addition to the preferences the following files are always ignored:

– Mac OS X resource fork files (starting with ._)

– MD 5 and SHA 1 files that have been created by Silverstack

When you are done with your offload source choice, you can proceed to select the copy destinations.


Choosing your copy destination

figure 5: choosing your destination and copy options

figure 5: choosing your destination and copy options

In this section you are able to choose the HDDs where Silverstack will backup the clips from your library. To edit the import options, click on the «Edit» button. The number of disks that can be copied simultaneously is only limited by your hardware. The destination is defined by the drive itself (figure 5 #1) as well as a folder on that drive. Click the small “ + ” button in the lower left of the table (#2) to add new drives or folders. Click the “ – ” button next to it to remove the selected folder or drive.

To optimize the way your files are stored and saved on the destination device, there is the possibility of using path wildcards (#3). With path wildcards Silverstack allows you to automatically create a custom folder structure for your backups based on the offloaded clips’ metadata.

If you just want to create references to video clips in Silverstack’s library without copying those clips to another storage device, you should mark the “Skip” checkbox (#4).

More copy options are available under the “More options” button (#5):

  • Checksum method: select the method used for verification after files have been copied. You can choose between multiple checksum methods like XXHash, MD5, SHA1 or choose to do only file size verification (faster but not recommended). You can learn more about the checksum methods in Checksum verification methods.
  • Document wildcard handling: modifies Silverstack’s behavior with non-clip files while using wildcards. More info in the Use of Wildcards article.
  • Overwrite existing files: you can tell Silverstack to overwrite clips if they already exist in the chosen folder.
  • Source Verification on/off: the option is on by default, meaning that during the verification process source and destination are read. When off, only the destination is read, giving less security but speeding up the overall copy process.

After determining your copy destinations click on “Backup clips” to register the clips in the library and start the copy job. All the information about the offload process can be supervised in the Jobs panel and -with less detailed information- in Silverstack’s lower bar.

Additionally, Silverstack offers the possibility of saving offload wizard templates. These templates can be chosen through the drop down menu shown in figure 5 #6. For more information about the offloading templates, please check the article Offload wizard templates.



Revert to the legacy Offload Wizard

It’s possible to use the classic multi-step offload wizard from previous Silverstack version by modifying the settings on the Preferences menu. On the «General» tab you can select the check box «Use old multi-step Offload Wizard»:

figure 6: General Preferences menu



Related articles:


Backup clips

Use of wildcards

MHL checksum verification

Multiple simultaneous copy jobs in Silverstack