Yes. iCloud is ONLY good for syncing contacts, mail and calendar and a few documents. iDisk/.MAC HAD actual storage space you coud drag your stuff from the office to home and back or drop HI RES photos/videos to your parents/friends house..so when you got there..it was somewhere online.
Your presentations, photos, movies and music take up WAY too much space for your iOS devices...so syncing is not viable solution for these heavy files. Especially when you dont' actually have the Hard Drive space to download them to.
The other VERY IMPORTANT question you need to ask yourself is.... WHERE IS MY BACKUP files for Contacts, Mail, and Calendars? because....There is NO BACKUP resource in syncing...if something goes really haywire..it goes haywire EVERYWHERE INSTANTANEOUSLY. You MUST to do manual backups from inside those apps on an actual Mac Computer. FILE/EXPORT/...blah blah blah. Every day or week or month..depending on how important your data is.
This makes iCloud only good for syncing everyday 'text' with low file size items.
Dropbox/Cubby/BOX...sites will take your heavy files and can even use FTP programs like Cyberduck, Transmit etc and drag and drop..you can even connect these drives like a regular drive onto your desktop..and drag and drop..but these are buggy. For no reason they will reject some files..so these servers don't like the way your file is named or the size..it will reject it. They don't act like regular loaded backup drives. So far Cubby has been the friendliest on using FTP programs (uses Webdav protocols)..but still has bugs like I mentioned above.
But yeah..iCloud is kind of worthless for any REAL BACKUP. It's a syncing package. Works GREAT as long as you have internet access. If you are an underground subway commuter or going long distances on Amtrak....you can kiss that all goodbye. Your device only becomes a gaming device ..so long as it doesn't rely on wifi or 4G access.
This is why I bought an ANDROID Tablet. It has SD cards and will take 128 GB USB sticks with an adapter through it's charge port along with it's built in 64GB micro SD slot!!! **** Yeah...No Really...and you can REALLY TRULY have all your data on your person. It's the way to go for a Doc sharing/media/game playing devices. Outsurpassing iOS device's ability to access your crap when you need it...anytime...anywhere. No Cloud or Syncing service can do that...only Android has swappable" added hard drive" storage ability.
Yeah..use my iPhone for cool apps and business..but when traveling or not in WiFi or 3G/4G spot...I can get ALL MY Shyte!