A client can resynchronize tree data structures representing a server, local, and sync state of content items in an account. In some aspects, the client identifies a local set of content items on the account and generates a local tree representing a filesystem state and including a local node for each item in the local set. The client determines a server state for a remote set of content items on the account. Based on the server state, the client generates a remote tree representing the remote set and including a respective node for each item in the remote set. Based on the local and remote trees, the client generates a sync tree including matching nodes between the local and remote trees, the sync tree representing a synchronized state between the filesystem state and the server state. The client then stores the local, remote, and sync trees.