• Tutorials (English & Spanish) from ATLAS.ti
• Working With Geo Documents in ATLAS.ti. (JHU Data Services can help with your geospatial research!)
• Team use of ATLAS.ti for collaborative research. Video tutorial. PDF overview
• ATLAS.ti for literature reviews from Ivana Radivojevic. 

External guides:

• From the University of Illinois Library: A thorough illustrated overview
• From University of Utah libraries: Another great feature and method overview
• From NYU Library Data Services: overview of file formats and use by teams

A more detailed overview from ATLAS.ti:

Storage & Backup: ATLAS.ti maintains associated text and A/V file types associated within a project bundle (format prefix: .atlproj), appearing as a single file on the PC. Moving or backing up projects requires moving the entire project bundle. Audio, video, and other files must be imported into ATLAS.ti and kept this the bundle in order to keep them associated with internal codes and annotations. Keep this in mind for managing the storage size of projects with multiple gigabytes of video, which cannot necessarily be kept on external storage when accessed by the program. Bundles kept on cloud storage, such as OneDrive, or even a network server, may be prone to corruption from file syncing and remote access. [more info] Projects should be accessed from a single desktop or laptop. This can make collaborative access to files challenging. ATLAS.ti uses its File Merge as a workaround if the "master" file is carefully administered merging each working "sub-project"  [more info]. Team projects involving text only could try ATLAS.ti Cloud. It is important to back up the project file ideally to another drive or cloud storage. Cloud storage is fine for backup copies, as long as it is not the accessed version.

Data Security: ATLAS.ti has password protection using standard encryption for "at rest" and "in transit" modes. (To set passwords, load a project and open the "File/Info" menu.) It is suitable for human subject personal and health identifiers, however, the security is only as good as the password management. If working collaboratively on a dataset, manage the shared password securely. Consider password management software such as LastPass or 1Password. 

Exporting and importing projects: nVivo can import projects from ATLAS.ti. ATLAS.ti can export the REFI-QDA Standard format (.qdpx) which allows importing projects to certain QDA software, and is also useful for long-term project preservatoin. Some project items are not exported. More information, oriented to data librarians, about archiving and preserving ATLAS.ti projects can be found in the ATLAS.ti data primer from the Data Curation Network