Please follow through the steps outlined below to establish a schedule for an archiving operation using Impression 3.0 or later in conjunction with Apple's iCal.
Step 1: If you're new to using Impression, you won't have any session bookmarks in your list yet. Session bookmarks are added automatically for each completed backup you have run. If you've a list full with session bookmarks, please skip ahead to 'Step 4' (below).
Step 2: In order to create the session bookmark that will be used to schedule your automated archiving operation, please add an item (or items) to the 'Archive these items' list and then run and complete that archiving operation.
Step 3: Next, run and complete the archiving operation.
Step 4: After completing an archiving session Impression will automatically create an appropriate session bookmark in your 'Bookmarks' list. You can edit the name of any selected bookmark or delete it entirely from the list by using the 'Edit' button below and to the left of the 'Bookmarks' pane.
Once you have the session bookmark in your list with your desired name, you're ready to schedule an automated archiving session using Apple's iCal. Click the 'Schedule' button under the bookmarks list after selecting the bookmark you'd like to schedule. Impression will then open iCal to schedule the event.
Step 5: Apple's iCal opens and creates a new event. iCal will additionally open an inspector window to let you fill out or modify the details of your scheduled event. Note how Impression has already provided many details to iCal regarding the event, including the file for the desired session bookmark (Impression's session bookmark files are located in your ~/Library/Application Support/Impression/sessions/ folder, with filenames that match the bookmark names in Impression's 'Bookmarks' list).
Be sure to select the time and repeat options that you'd like to commit to this scheduled operation. If you change your mind later, you can always go back and edit the iCal event. Experiment with the settings to see how best to set up your iCal backup schedule(s).
Step 6: That's it for scheduling an automated archiving session. At your chosen time and date Impression will automatically launch, load the session file that you've scheduled to run and automatically initiate the archiving preflight options sheet. Clicking the 'Begin Archiving' button will begin your archiving session.
Remember to untie that string from around your finger that you've been using to remind yourself of your weekly backups!
If the operation fails to launch, please make sure you haven't deleted or renamed the session bookmark after the iCal event was created. If you have, please open the event's inspector and reestablish its connection to a targeted session bookmark file, as seen in 'Step 5' (above).
Also make sure that you've installed Impression 3.0 later, and that you've no other, earlier copies of Impression installed on your system. Please remove them if they are present, or set all '.ses.' files to open using Impression 3.0 by default using the Finder.