This is a hybrid hardware/software question with a few more factors than the typical "freeing disk space" question.
I have an older iMac with (I think) about a 250 GB hard drive. It's been running out of disk space for a while, and each time I find some way to recover a bit more room. I've used DaisyDisk, etc. to identify large unused files, moved my iPhone/iPad backups to cloud, etc.
At this point there's just one big culprit left: our iPhoto library, which has been fed increasingly large photos. (iPhone 4S + Nikon DSLR -> way more megapixels than my earliest photos!) The iPhoto library hogs most of the space now and I'd like to avoid one-by-one reviewing & deleting photos if I can help it.
Is there a software solution? Can I tell iPhoto to archive the oldest photos to a NAS? (I have plenty of network space) And if I do that, will photos take longer to open?
Is there a hardware solution? For instance, if I buy a Time Capsule is there a one-step way to relocate my existing photo library? And again, will it slow down the use of photos on my machine and/or prevent me from seeing all of my albums?
Also, I'd like to start moving some of my music back to the iMac - any solution that will let me do the same for iTunes (keep some local, move some to network storage) would be appreciated.