A capture action automates the capture of one or more items.
To add items you can't normally select, hold down one or both of the following keys when clicking the + button:
These options change how the capture action behaves.
The Deep Scan and Defer De-Duplication options address rather obscure issues and should normally be left off. Turn the Verify option if you suspect your archive's storage media or connection is suspect.
Selecting the Deep Scan option causes QRecall to ignore the filesystem change history and scan every directory in the item's hierarchy looking for items to capture.
Filesystem change history allows QRecall to quickly skip to just those directories that contain modifications. It is not, however, impervious to being tricked and you may occasionally encounter software that makes filesystem changes in such a way that the filesystem change history won't detect them. Setting this option avoids missing those changes by scouring every directory, at the expense of additional time and I/O.
QRecall periodically (about every two weeks) ignores the filesystem change history and performs a deep scan looking for changes. This option merely forces that to happen on every capture. See the Filesystem Change History Trust Limit advanced setting.
QRecall's defining feature is its ability to perform block-level de-duplication on every file it captures. This process, however, can be expensive in terms of time and computer resources.
Normally, it's very fast and efficient, but will begin to bog down as the archive size increased. (For the technically minded, the amount of work required to de-duplicate data increases exponentially with the size of the data corpus.) Archives larger than 3TB may exhibit significant reductions in capture performance.
The Defer De-duplication option streamlines the capture action by skipping data de-duplication; captured file data is simply appended to the archive verbatim. The data associated with those items is tracked, and the next compact action will perform the pending de-duplication en masse.
Another situation where this option might be beneficial is where the capture is being performed over a very slow network connection (say, a laptop using Wifi), but the compact action is performed by a different system with fast access to the archive (say, a high speed network or Thunderbolt connection). In this situation, deferring de-duplication may provide a net gain in performance.
The Verify option adds an additional step at the end of the capture that reads all of the records the capture just wrote to verify that they were successfully written and are undamaged.