When you upload photos and video to Flickr, it stores them in 'Photostream'. Photostream can be displayed as a 'justified' view, a slideshow, a 'detail' view or a 'datestamped archive'. Photostream always shows your most recently uploaded photos and videos. You can easily change the order of photos in Flickr Photostream by editing the posting dates for photos. To rearrange the photos, login to your account and open Photostream. Click on the photo and click '...' icon (More menu) located at the bottom right corner of the page. Select 'Edit title, tags, and dates' option. You will see 'Date taken on' and 'Date posted to Flickr'. Change the date the photo was posted. By changing the 'Date posted to Flickr', you can rearrange the photos in Flickr Photostream.
You can install PicBackMan's Flickr uploader for Mac from the website and start backing up photos and videos.
Quick Tip to ensure your Photos never go missing
Photos are precious memories and all of us never want to ever lose them to hard disk crashes or missing drives. PicBackMan is the easiest and simplest way to keep your photos safely backed up in one or more online accounts. Simply download PicBackMan (it's free!), register your account, connect to your online store and tell PicBackMan where your photos are - PicBackMan does the rest, automatically. It bulk uploads all photos and keeps looking for new ones and uploads those too. You don't have to ever touch it.