Hard drives are your best bet. You should have at least three though, One to work off/ store you images on, then a backup of that on another drive, I like to use arRsync for backups. Then, if you can, another backup at an offsite location (maybe family or friends house) that you backup once every couple months. Great video on Chase Jarvis's file management system. and the asmp guidelines on file management
edit- forgot to say to convert all you raw files to DNG which is currently the most universal raw file format.
You might only need to back up a few documents and photos. But Time Machine will save the state of your machine as it is now. Imagine you need to restore it for some reason (hardware/software failure, loss, accident, etc). It'll restore your environment as it is now without the hassle of setting up everything again.
I personally use Time Machine and back up important documents to an encrypted DMG (using arRsync) that's on Dropbox.
You can set up a script with rsync, or if you prefer it with a graphical tool, there's arRsync. And CarbonCopyCloner also uses rsync internally and I believe it supports scheduled backups.
rsync would have been my first idea, and there are GUI tools like arRsync to make it easier to set up. And CarbonCopyCloner also uses rsync internally and I believe it supports automated backups.
arRsync, if you want a gui for the command-line rsync.
Note that you should start out by only syncing portions of your home directory, and /Applications and work up from there if necessary. If your iMac OS is factory-installed, it won't have some drivers for your MBP and vice-versa.
You may find that you also need to sync /Library/Application support for some apps to run properly.
It's the Option-key. When you Option-drag a folder and another folder with the same name already exists, it will offer to merge them, but only if the items in them are different. If there's a file or folder with the same name in both of them, you won't get the merge option.
You can also merge with rsync, look up the man page for options. Or use this GUI: http://arrsync.sourceforge.net
I only moved my media files (music) to the card. The library files are still on the internal SSD and backup up with Time Machine. There are ways to add external volumes to Time Machine. But it's annoying to set up and maintain.
I use arRsync to backup a few external USB disks and the card in the Nifty drive. http://arrsync.sourceforge.net/
> So you sync your folders to Cryptomator and than that syncs an enrypted version to Dropbox / Google Drive Ect
Yup, exactly like this. A Cryptomator vault is like a virtual box and everything you put in there is encrypted. It can only be decrypted with a password that you set. Works a bit similar to Disk Images. Just download the app and play around with it. It's open source and freeware. At least the desktop apps, the mobile apps cost money (one-time purchase).
I'm using arRsync to sync my folders to Cryptomator vaults on the external drive. The apps from Dropbox and Google upload the encrypted vaults.
MacDropAny is helpful to add stuff that's not in the main folders of the cloud apps.
This sounds complicated but once set up, I just need to start the apps and they do their thing.
The built in rsync with arRsync as a front end. Run periodically with launchd or a cron job. There are several GUI frontends, like Lingon, CronniX or Launchd Editor.
Are you just trying to back up the files on your local computer? If so, Time Machine is the easiest option. Second to that is arRsync.
I don't know a lot about backing up Flickr, but a quick search found this.
Hope that helps...