My photos are very important to me, so i do several backups:
1) The iPhoto Library is rsync'd to an external HDD
2) The iPhoto Library is rsync'd to a local FreeNAS box
3) Arq backup to S3 <a href="http://www.haystacksoftware.com/arq/" rel="nofollow">http://www.haystacksoftware.com/arq/</a>
4) Crashplan backup to 3 locations: an external drive, a local server (not the FreeNAS box), as well as Crashplan central.<p>Terabytes are cheap, memories are not.
I use duplicity (<a href="http://duplicity.nongnu.org" rel="nofollow">http://duplicity.nongnu.org</a>) to locally encrypt (GPG) and backup to a LAN machine running ZFS and to one or more cloud services (Google, AWS) depending on the data. This is automated using cron.<p>Whatever backup option you decide on, do not forget to test the recovery/restore process at least once a year. You can tweak your strategy anytime based on current cloud storage prices.
AWS Bucket w/revisions enabled connected to PictureLife.com. Amazon raises invoices directly to me for storage usage and if PictureLife shuts down (hopefully not) then there's no need to export data because I own/control the data. ie. AWS provides the hosting and PictureLife provides the product on-top of my hosting.
Manual backup to external HDD + automatic backup to google drive with this app <a href="https://support.google.com/picasa/answer/4392268" rel="nofollow">https://support.google.com/picasa/answer/4392268</a>
I also like the opportunity to view these photos through Google+ Photos interface.
Time Machine to a Linux file server (large RAIDZ2 ZFS array) for both my MBP and the GF's iMac.<p>CrashPlan family edition (unlimited backups for up to ten computers) for both of us, the Linux file server and my parents laptops as well.
I upload my favourite shots to Flickr full res. This is about 1% of my photo collection.<p>I then pray my HDD doesn't fail!<p>One day I'll get organised and backup everything up to one of those 1TB NAS with auto-cloud sync :S
Google Drive - syncs automatically full res photo's from my phone which shortly end up sync'd to my macbook.<p>Drive is the authoritive store for my photo's - any thing on my PC can be lost with no problems
Unison via SSH to a Raspberry-Pi-attached USB HDD. Upload to Flickr via cron-triggered python script from RasPi. Arq to S3. Hoping that "only to camlistore" will be the answer in 3-5 years.