Two recent articles by Howard Oakley:
have confirmed and explained the reasons behind my decision to switch from using my Time Capsule with Time Machine to using Time Capsule with Arq instead.
While I did not do the extensive research that Howard did, I knew that the experience of using Time Capsule with Time Machine was extremely poor.
However, Arq is designed to run over a network. So I reformatted the drive in my Time Capsule and pointed Arq at it, and it has been working great ever since.
I still have a local Time Machine backup to a local drive, but I think I’m done trying to use Time Machine over a network until Apple invests some time in improving the experience (which, sadly, I don’t foresee happening, but I’d love to be wrong).