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CompanyDropboxSyncplicitySpideroakSugarSyncMozyCarboniteAmazon S3Google DriveDiinoMemopalrsyncaDriveOthers

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URLhttp://www.syncplicity.com/https://spideroak.comhttps://www.sugarsync.com/products/sync_pricing.htmlhttps://mozy.com/homeuse rsync to backup into my external harddrive?? manual backup of foldershttp://www.adrive.com/static/storageplans_basichttp://lifehacker.com/5064688/online-storage-feature+by+feature-comparison-chart:

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Pricing / Year / Storage / # Machines- 100U$/year for 50GB for Multiple Machines
- 200U$/year for 100GB

https://www.getdropbox.com/plans		- 99U$/year for 50GB for multiple computers.
- Limited promo: 99US$ for 100GB for the first year.
- You can pay for extra storage, but it doesn't show how much.		100U$/year per 100 GB increment for multiple machines100U$/year for 60GB for multiple machines
150U$/year for 100GB
250U$/year for 250GB		60U$/year UnlimitedGB for each machine (but they don't sync). http://support.mozy.com/docs/en-user-home-mac/guide/concepts/faq_adding_machine.html55U$/year per computer | unlimited GBits 0.15U$/mo./GB. That's expensive for 100GB+ (100GB = 15U$/mo. = 180U$/year)50GB Free

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Syncs multiple machines?YesYes. And you can include and exclude any folder from synchronization. http://www.syncplicity.com/Features/Synchronization.aspxYesYesnoweb only

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Selective Syncing? Specify which folders will sync in each computerNot yet: http://wiki.getdropbox.com/UpcomingFeatures. Workaround (create a 2GB work account): http://forums.getdropbox.com/topic.php?id=7246&replies=10Looks like an Yes: restoring your data is just like synchronizing to a new computer. Install Syncplicity on the new computer and tell it what directories to synchronize. The client will notice the directories are empty and begin downloading your data.(You can include and exclude any folder from synchronization)Yes. And it asks to which folder you want to sync: http://support.sugarsync.com/ics/support/KBAnswer.asp?questionID=976no

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Does it accept big file sizes (5GB+)?Yes, any file size: https://www.sugarsync.com/products/sharing/sync_file_sharing.htmlYesAccepts 4GB+ files, but you must 'check' them manually

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Does it sync external drivesNo, even with symbolic link, if its not online, it think its deletedI think not (read comment on BAD below)Only if you leave the Ext. Drive ALWAYS connected.doesn't backup External Harddrives [http://www.carbonite.com/customersupport/ViewPost.aspx?postid=78951]

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Can I share specific files via URLDirect URL to files (on public folder) & Shares specific folders with people (via email).Yes, direct link for files.
For folders, to download many files, your friends needs to create an account:
http://www.syncplicity.com/Video/Sharing.aspx		Share specific files & folders via a Share ID.No

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Can people (with proper password) upload files into my account?Yes (didn't tried it yet)Yes. You choose if the folder is read or read&writeYes. Read Only or Editable: https://www.sugarsync.com/products/sharing/sync_folder_sharing.htmlNo

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Does it have web access (for me) to download files?YesYesYesYes

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Does it have web access (for me) to upload files?YesYesYesNo, not yet

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Win, Mac and Linux client?YesWin & Mac (beta). No LinuxYesWin & Mac in beta. No LinuxWin & Mac. No Linux

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BAD things from this serviceFocus on Sync, not a Backup solution: http://forums.getdropbox.com/topic.php?id=9288&replies=4Syncplicity Problems: http://forums.getdropbox.com/topic.php?id=9301&replies=2I first was a dropbox user but moved to sugarsync when I decided to selectively sync everything i want (except videos, the rest is about 90go). The ability to restore deleted files is priceless but the lack of external drive compatibility is a shame. Sugarsync outstand dropbox in many ways but still need some tweaks. http://lifehacker.com/5246103/first-look-at-sugarsyncs-uber+detailed-syncing-options#c12704782It doesn' sync computers...

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Bad 2Issue on PSD files (but this might happen on all). http://support.sugarsync.com/ics/support/default.asp?deptID=4579&task=knowledge&questionID=361Seems like Restoring files is very problematic.
-http://news.cnet.com/8301-13554_3-9752330-33.html
-http://www.marginnotes.net/2009/03/19/mozy-great-until-you-need-to-restore/

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Observationshttp://computershopper.com/software/reviews/spideroak-3.0http://lifehacker.com/5246103/first-look-at-sugarsyncs-uber+detailed-syncing-options