Get started as an end user
This page is for people who use Osiris to look after their own mailbox and OneDrive — not for the administrator who installed it. If you administer Osiris for your organization, see For administrators → Get started instead.
What Osiris does for you
Section titled “What Osiris does for you”Once your administrator has connected your organization to Osiris and your account is in scope, Osiris keeps regular, encrypted, deduplicated backups of:
- your Exchange Online mailbox — mail, calendar and contacts, or
- your IMAP mailbox, and
- your OneDrive, if your organization backs up OneDrive.
You do not have to do anything for the backup itself to run; it happens on your organization’s schedule in the background. What you do yourself — finding something in a backup, checking what it was, restoring it, or downloading it — is covered on the next page: First steps.
A second capability, archiving — a long-term, unalterable copy kept for legal evidence, searchable by you far beyond ordinary backup retention — is planned but not available yet. See Usage for its current status, and Backup vs. archive if you want to understand how the two differ.
Signing in
Section titled “Signing in”Osiris does not use a separate password you have to remember for everyday use. Which of the following applies to you depends on what your administrator has set up:
- Passkey — sign in with Touch ID, Windows Hello, your phone or a security key, no password involved. This is offered only once your organization’s Osiris installation runs on its own verified HTTPS domain; if you do not see this option, your administrator has not reached that point yet.
- Emergency sign-in — email and password, followed by a six-digit code from an authenticator app on your phone (Microsoft Authenticator, Google Authenticator, 1Password, Bitwarden, or any other app for time-based codes). If your account has no authenticator set up yet, you are taken straight to its setup the first time you sign in this way. If you lose your phone, a one-time recovery code you were given when you set the authenticator up gets you back in.
- Sign in with Microsoft — using your organization’s Microsoft 365 account directly, with no separate Osiris credential at all. This is built into Osiris but not enabled yet in the current beta; until it ships, use a passkey or the emergency sign-in above.
Once you are signed in, you can add a passkey, replace your authenticator app, or see and end your other sessions at any time: open your account menu (your avatar) and choose Sign-in security.
Your data at a glance
Section titled “Your data at a glance”The Overview page, which you land on after signing in, shows how your organization’s Osiris installation is doing as a whole: when backups last succeeded, whether a restore check has actually proven they can be read back, and how much is stored. These figures cover your whole organization, not only your own mailbox — they tell you Osiris is healthy, not what is in your backup specifically.
For your own data, go to Restore in the navigation: the mailbox, IMAP account or OneDrive picker there only ever lists what belongs to you, marked Yours. Browsing, previewing, restoring and downloading your own mail and files from there is covered next: First steps.
If backups look wrong, are missing, or you cannot find something you expect, contact your Osiris administrator; end users cannot change backup schedules or storage settings themselves.