# ownCloud Administrators Manual

# Introduction

The ownCloud Versions app maintains older versions of a file which have been modified by an ownCloud user.

## Expiry of versions

The versions app expires old versions automatically to make certain that the user doesn’t run out of space. The following algorithm is used to delete old versions:

- ownCloud keeps one new version every 2 seconds for the first 10 seconds
- ownCloud keeps one new version every minute for the first hour
- ownCloud keeps one new version every hour for the first 24 hours
- ownCloud keeps one new version every day for the first 30 days
- ownCloud keeps one new version every week thereafter.

The versions are adjusted along this algorithm every time a new version is created.

## Space limitations

In addition to the expiry of versions, ownCloud’s versions app makes certain never to use more than 50% of the user’s currently available free space. If stored versions exceed this limit, ownCloud will delete the oldest versions first until it meets this limit.