Quote:
Originally Posted by Katsunami
If you sync files through your cloud, you might actually delete all the copies at once  If you need to get a file back using a device that should still have it, don't forget to unplug the system from the internet before starting....
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Not necessarily.
Dropbox has a safety net -- you have thirty days to undelete a file, or forever if you have a paid plan.
I've never actually used OwnCloud, because I've always been happy with Dropbox. Does OwnCloud allow you to save deleted/modified files in some sort of cache/Trash? Yes, it would consume more space, but that isn't the big concern...
EDIT: Sure you can, thought so

:
https://doc.owncloud.org/server/7.0/...etedfiles.html