How to recover collections after backup
                    Hi!
I am writing to ask how to recover collections.
For a problem in my computer, I reinstalled windows, and I saved all files in “Zotero” folder for backup.
After reinstalling, I restored the backup files in Zotero folder in the new windows.
However, when I synced desktop Zotero to server Zotero, almost of collections (and its sub-collections) were disappeared.
(All items remained as unfiled items.)
Fortunately, as I have backup files still, I removed all items from server Zotero and repeated the above action to recover collections.
(I thought server Zotero would be changed according to desktop Zotero.)
But still when I sync Zotero, this problem happened again.
I want to recover the collections because I made them painstakingly.
Please let me know how to resolve this problem.
Thanks!
                
                            I am writing to ask how to recover collections.
For a problem in my computer, I reinstalled windows, and I saved all files in “Zotero” folder for backup.
After reinstalling, I restored the backup files in Zotero folder in the new windows.
However, when I synced desktop Zotero to server Zotero, almost of collections (and its sub-collections) were disappeared.
(All items remained as unfiled items.)
Fortunately, as I have backup files still, I removed all items from server Zotero and repeated the above action to recover collections.
(I thought server Zotero would be changed according to desktop Zotero.)
But still when I sync Zotero, this problem happened again.
I want to recover the collections because I made them painstakingly.
Please let me know how to resolve this problem.
Thanks!
This is an old discussion that has not been active in a long time. Before commenting here, you should strongly consider starting a new discussion instead. If you think the content of this discussion is still relevant, you can link to it from your new discussion.
 Upgrade Storage
If you want to permanently restore to a backup that's older than the current online state, you need to use Restore to Online Library after restoring from the backup:
https://www.zotero.org/support/zotero_data#restoring_your_zotero_library_from_a_backup_and_overwriting_synced_changes
I solved it!