.Mac is great and for me good value for money as it saves my time and has many features I use on a regular basis :-
I publish 6 web sites from iWeb to .Mac very easily and quickly.
I'm currently only using iWeb for publishing to one of my domains' websites. I find it personally irritating that I have to publish to folder and then FTP the whole thing because Apple chose to 'crippleware' that feature. My workaround is to simply let the FTP run during a meal, or do it overnight.
I publish Photos and Videos from iMovie and iPhoto.
All of which resides on my 10Gb of space (of which I am only using 2Gb at the moment.
YMMV. My current iPhoto library is 60GB. I can't even use a FAMILY .mac account if I wanted to make it all available online (and I haven't even started to digitize my film yet).
I use the free Backup software to backup key information to my .Mac iDisk.
Since the 50GB of the family account isn't even enough for me to do just my iPhoto image library, remote data backup via .mac isn't an option for me, even before I go check what size my Documents folder is. YMMV.
I use iDisk to transfer large qualities of data to my friends.
I just FTP it up to my domain and then email them the URL to click to download. Works cross-platform, too.
For me it is simply the only way to do all the above seamlessly and with no fuss or pain. Yes you can do it for free or less from various suppliers, but for ease of use it can't be beaten.
I don't disagree entirely, but some things are worth some extra hassles for, such as the trade-off between "seamless" and simple raw storage capacity, which is why my needs are higher.
And more pragmatically, the general utilty of remote storage is still limited by our local bandwidth connections and their price points.
IMO, what's pragmatically needed for me is the equivalent of a 10bT (1.25MByte/sec) worth of bandwidth, as this would theoretically allow a transfer (ie, backup) of 100GB of data per 22 hours (assumes 100% efficiency; no bandwidth conflicts, etc). Afterall, you don't want a weekly backup to take up the entire week!
But in the USA, bandwidth isn't cheap. Even I were you go to "just" a T1, that's 0.192 MByte/sec (1/10th the speed of 10bT, and 1/1000th of Gigabit Ethernet), which means that the max daily transfer rate (eg, data backup) is ~16.5GB, which would mean for me personally that just my iPhoto library would take 4 days running full blast (no other use) to transfer but a single backup....and the cost for a T1 is roughly $500/month.
And forget going faster than 10bT: a T3 is roughly 5MByte/sec, but average cost is around $10,000/month.
Gosh, for $500/month, I can simply buy a new external HD every month and rent a big Safety Deposit Box at my local bank for my remote site backup...and save $300/month. The grim reality is the the cost of bandwidth needs to come down by roughly a full order of magnitude (10x) for such things to really become practical for the home consumer market to seriously consider implimenting.
Maybe AppleTV and other 'Streaming Media' services will help, but considering the problems with 'Net Neutrality' by various ISPs...including what I've seen as suspiciously slow FTP transfers on my current ISP...I don't think that most ISPs want to be a simple provider of the commodity of bandwidth because commodities don't carry fat profit margins. As such, market forces are against the consumer for this type of low-profit product.
-hh