How to back up linked file?
My understanding is, in Zotero's terminology, attached file and linked file are different. By attching a file, the file will be stored in Zotero's 'xxx/profile/ggv43wjy.default/zetoro/storage/XXXXXXXX' under the 8-digit random folder given by zotero. by linking a file to an entry in zotero, you right click on the entry and link any file on your computer you like. for the attached file, it's easy to make back up. You just copy the folder where the storage locates, and when you shift to a new computer, you copy it again, and restart the firefox and zotero. But for the linked files, suppose all the linked files are within just one folder, if I change my computer, there is still no option to automatically reserve the linkage between the entries and linked files?
There are ways to bulk edit the link structure using sqlite or the new api, but right now none of them are even close to "out of the box". Relative links are planned but no one know when they'll be implemented.
My second post on virtual folders just points to the possibility of storing items in Zotero, but having them easily "browsable" - i.e. all pdfs in one folder - at the same time. That only works so-so on Windows XP, but very nicely on Vista and W7 as well as Mac and Linx
http://thinkabdul.com/2007/03/29/tip-how-to-create-virtual-folders-in-windows-xp-and-vista/
To avoid having to synchronise the files, one can actually use an external storage device as the local path to store the files.