In Browse, right click a sheet, folder or workspace and select Request Backup, or open the workspace panel three dot menu then Back up now, ticking Include attachments. Backups need a Business or Enterprise plan, Viewer permission or higher for a sheet or one time workspace backup, and Owner or Admin for recurring weekly backups. The file is a zip holding one Excel xlsx per sheet with comments on a separate tab plus folders of inline images and uploaded attachments, and it excludes reports, dashboards, formulas, workflows, cross sheet references and formatting.
What it holds
Sheets of rows and cells, comments, attachments, inline images, reports and dashboards.
Find the size
Backup files are capped at 4 GB. A System Admin reads counts at Admin Center then Plan Insights then Plan Usage, which lists total sheets, reports, dashboards, forms and workspaces and updates once per day.
What to enter on the form
Smartsheet in files, and the year your company started using it. Seller form