Use an External USB Hard Drive with a Time Capsule and Save $$$
You can plug any USB hard drive into a Time Capsule and expand the available disk space of the Time Capsule that way. This is then accessible as usual as a Network Attached Storage device for your Mac backups or whatever, and you can then even directly backup wirelessly to that external drive connected to the Time capsule using Time Machine.
Apparently this feature has existed since the dawn of Time Capsule, but I just inadvertently discovered this. This is great because it allows you to expand your Time Capsule storage yourself if you run out of space, but also because you can buy the cheaper model and then just attach a huge external drive to create a massive capacity NAS device.
You may have seen that Apple announced two new versions of the Time Capsule, they come in 2TB for $299 and 3TB for $499. Spending another $200 just to get another 1TB of storage seems a bit expensive, and that’s exactly where I found the tip on 9to5mac. In a post where they say the new 3TB Time Capsule price tag is “crazypants” they suggest you buy the 2TB model and then use your own 3TB drive for a total of 5TB of storage. This is great idea, and suddenly the Time Capsule became a lot more appealing to me, because this means less money for more storage.
If you feel like doing this, both the Seagate 3TB USB external hard drive and Western Digital 3TB USB external drive are $149 with free shipping from Amazon. Stack that on your brand spanking new Time Capsule 2TB, and you’ve got yourself some serious wireless storage capacity.